Stephen Kolbe v. Lawrence Hogan, Jr. ( 2016 )


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  •                                PUBLISHED
    UNITED STATES COURT OF APPEALS
    FOR THE FOURTH CIRCUIT
    No. 14-1945
    STEPHEN V. KOLBE; ANDREW C. TURNER; WINK'S SPORTING GOODS,
    INCORPORATED; ATLANTIC GUNS, INCORPORATED; ASSOCIATED GUN
    CLUBS OF BALTIMORE, INCORPORATED; MARYLAND SHALL ISSUE,
    INCORPORATED; MARYLAND STATE RIFLE AND PISTOL ASSOCIATION,
    INCORPORATED;    NATIONAL  SHOOTING   SPORTS    FOUNDATION,
    INCORPORATED;     MARYLAND  LICENSED    FIREARMS    DEALERS
    ASSOCIATION, INCORPORATED,
    Plaintiffs - Appellants,
    and
    SHAWN J. TARDY; MATTHEW GODWIN,
    Plaintiffs,
    v.
    LAWRENCE J. HOGAN, JR., in his official capacity as Governor
    of the State of Maryland; BRIAN E. FROSH, in his official
    capacity as Attorney General of the State of Maryland;
    COLONEL WILLIAM M. PALLOZZI, in his official capacity as
    Secretary   of   the   Department  of   State   Police   and
    Superintendent of the Maryland State Police; MARYLAND STATE
    POLICE,
    Defendants - Appellees.
    ------------------------------
    STATE OF WEST VIRGINIA: STATE OF ALABAMA; STATE OF ALASKA;
    STATE OF ARIZONA; STATE OF FLORIDA; STATE OF IDAHO; STATE OF
    KANSAS; STATE OF LOUISIANA; STATE OF MICHIGAN; STATE OF
    MISSOURI; STATE OF MONTANA; STATE OF NEBRASKA; STATE OF NEW
    MEXICO; STATE OF NORTH DAKOTA; STATE OF OKLAHOMA; STATE OF
    SOUTH CAROLINA; STATE OF SOUTH DAKOTA; STATE OF TEXAS; STATE
    OF UTAH; STATE OF WYOMING; COMMONWEALTH OF KENTUCKY;
    TRADITIONALIST   YOUTH   NETWORK,    LLC;   NATIONAL   RIFLE
    ASSOCIATION OF AMERICA; CRPA FOUNDATION; GUN OWNERS OF
    CALIFORNIA; COLORADO STATE SHOOTING ASSOCIATION; IDAHO STATE
    RIFLE    &   PISTOL   ASSOCIATION;   ILLINOIS   STATE   RIFLE
    ASSOCIATION; KANSAS STATE RIFLE ASSOCIATION; LEAGUE OF
    KENTUCKY   SPORTSMEN,    INC.;  NEVADA  FIREARMS   COALITION;
    ASSOCIATION OF NEW JERSEY RIFLE & PISTOL CLUBS; NEW MEXICO
    SHOOTING SPORTS ASSOCIATION; NEW YORK RIFLE & PISTOL
    ASSOCIATION;    TEXAS   STATE  RIFLE   ASSOCIATION;   VERMONT
    FEDERATION OF SPORTSMAN'S CLUBS; VERMONT RIFLE & PISTOL
    ASSOCIATION; GUN OWNERS OF AMERICA, INC.; GUN OWNERS
    FOUNDATION; U.S. JUSTICE FOUNDATION; THE LINCOLN INSTITUTE
    FOR RESEARCH AND EDUCATION; THE ABRAHAM LINCOLN FOUNDATION
    FOR PUBLIC POLICY RESEARCH, INC.; CONSERVATIVE LEGAL DEFENSE
    AND EDUCATION FUND; INSTITUTE ON THE CONSTITUTION; CONGRESS
    OF RACIAL EQUALITY; NATIONAL CENTER FOR PUBLIC POLICY
    RESEARCH; PROJECT 21; PINK PISTOLS; WOMEN AGAINST GUN
    CONTROL; THE DISABLED SPORTSMEN OF NORTH AMERICA; LAW
    ENFORCEMENT LEGAL DEFENSE FUND; LAW ENFORCEMENT ACTION
    NETWORK; LAW ENFORCEMENT ALLIANCE OF AMERICA; INTERNATIONAL
    LAW ENFORCEMENT EDUCATORS AND TRAINERS ASSOCIATION; WESTERN
    STATES SHERIFFS' ASSOCIATION,
    Amici Supporting Appellants,
    LAW CENTER TO PREVENT GUN VIOLENCE; MARYLANDERS TO PREVENT
    GUN VIOLENCE, INCORPORATED; BRADY CENTER TO PREVENT GUN
    VIOLENCE; STATE OF NEW YORK; STATE OF CALIFORNIA; STATE OF
    CONNECTICUT; STATE OF HAWAII; STATE OF ILLINOIS; STATE OF
    IOWA; STATE OF MASSACHUSETTS; STATE OF OREGON; DISTRICT OF
    COLUMBIA,
    Amici Supporting Appellees.
    Appeal from the United States District Court for the District of
    Maryland, at Baltimore.    Catherine C. Blake, District Judge.
    (1:13-cv-02841-CCB)
    Argued:   March 25, 2015              Decided:   February 4, 2016
    Before TRAXLER, Chief Judge, and KING and AGEE, Circuit Judges.
    2
    Affirmed in part, vacated in part, and remanded by published
    opinion. Chief Judge Traxler wrote the opinion for the court as
    to Parts I, II, III, V, and VI, in which Judge Agee joined.
    Judge Agee wrote separately as to Part IV. Judge King wrote an
    opinion dissenting as to Part III and concurring in the judgment
    as to Parts IV and V.    Chief Judge Traxler wrote a dissenting
    opinion as to Part IV.
    ARGUED: John Parker Sweeney, BRADLEY ARANT BOULT CUMMINGS LLP,
    Washington, D.C., for Appellants. Matthew John Fader, OFFICE OF
    THE ATTORNEY GENERAL OF MARYLAND, Baltimore, Maryland, for
    Appellees.   ON BRIEF: T. Sky Woodward, James W. Porter, III,
    Marc A. Nardone, BRADLEY ARANT BOULT CUMMINGS LLP, Washington,
    D.C., for Appellants.   Douglas F. Gansler, Attorney General of
    Maryland, Jennifer L. Katz, Assistant Attorney General, OFFICE
    OF THE ATTORNEY GENERAL OF MARYLAND, Baltimore, Maryland, for
    Appellees.    Kyle J. Bristow, BRISTOW LAW, PLLC, Clarkston,
    Michigan; Jason Van Dyke, THE VAN DYKE LAW FIRM, PLLC, Plano,
    Texas, for Amicus Traditionalist Youth Network, LLC.     Patrick
    Morrisey, Attorney General, Elbert Lin, Solicitor General, Julie
    Marie Blake, Assistant Attorney General, OFFICE OF THE ATTORNEY
    GENERAL OF WEST VIRGINIA, Charleston, West Virginia, for Amicus
    State of West Virginia; Luther Strange, Attorney General of
    Alabama, Montgomery, Alabama, for Amicus State of Alabama;
    Michael C. Geraghty, Attorney General of Alaska, Juneau, Alaska,
    for Amicus State of Alaska; Thomas C. Horne, Attorney General of
    Arizona, Phoenix, Arizona, for Amicus State of Arizona; Pam
    Bondi, Attorney General of Florida, Tallahassee, Florida, for
    Amicus State of Florida; Lawrence G. Wasden, Attorney General of
    Idaho, Boise, Idaho, for Amicus State of Idaho; Derek Schmidt,
    Attorney General of Kansas, Topeka, Kansas, for Amicus State of
    Kansas; James D. Caldwell, Attorney General of Louisiana, Baton
    Rouge, Louisiana, for Amicus State of Louisiana; Bill Schuette,
    Attorney General of Michigan, Lansing, Michigan, for Amicus
    State of Michigan; Chris Koster, Attorney General of Missouri,
    Jefferson City, Missouri, for Amicus State of Missouri; Timothy
    C. Fox, Attorney General of Montana, Helena, Montana, for Amicus
    State of Montana; Jon Bruning, Attorney General of Nebraska,
    Lincoln, Nebraska, for Amicus State of Nebraska; Gary King,
    Attorney General of New Mexico, Santa Fe, New Mexico, for Amicus
    State of New Mexico; Wayne Stenehjem, Attorney General of North
    Dakota, Bismarck, North Dakota, for Amicus State of North
    Dakota; E. Scott Pruitt Attorney General of Oklahoma, Oklahoma
    City, Oklahoma, for Amicus State of Oklahoma; Alan Wilson,
    Attorney General of South Carolina, Columbia, South Carolina,
    for Amicus State of South Carolina; Martin J. Jackley, Attorney
    3
    General of South Dakota, Pierre, South Dakota, for Amicus State
    of South Dakota; Greg Abbott, Attorney General of Texas, Austin,
    Texas, for Amicus State of Texas; Sean Reyes, Attorney General
    of Utah, Salt Lake City, Utah, for Amicus State of Utah; Peter
    K. Michael, Attorney General of Wyoming, Cheyenne, Wyoming, for
    Amicus State of Wyoming; Jack Conway, Attorney General of
    Kentucky, Frankfort, Kentucky, for Amicus Commonwealth of
    Kentucky.    Charles J. Cooper, David H. Thompson, Peter A.
    Patterson, COOPER & KIRK, PLLC, Washington, D.C., for Amicus
    National Rifle Association of America, Inc.        C.D. Michel,
    Clinton B. Monfort, Anna M. Barvir, MICHEL & ASSOCIATES, P.C.,
    Long Beach, California, for Amici CRPA Foundation, Gun Owners of
    California, Colorado State Shooting Association, Idaho State
    Rifle & Pistol Association, Illinois State Rifle Association,
    Kansas State Rifle Association, League of Kentucky Sportsmen,
    Inc., Nevada Firearms Coalition, Association of New Jersey Rifle
    & Pistol Clubs, New Mexico Shooting Sports Association, New York
    State Rifle & Pistol Association, Texas State Rifle Association,
    Vermont Federation of Sportsmen's Clubs, and Vermont Rifle &
    Pistol Association.   Michael Connelly, U.S. JUSTICE FOUNDATION,
    Ramona, California, for Amicus U.S. Justice Foundation; Robert
    J. Olson, Herbert W. Titus, William J. Olson, John S. Miles,
    Jeremiah L. Morgan, WILLIAM J. OLSON, P.C., Vienna, Virginia,
    for Amici Gun Owners of America, Inc., Gun Owners Foundation,
    U.S. Justice Foundation, The Lincoln Institute for Research and
    Education, The Abraham Lincoln Foundation for Public Policy
    Research, Inc., Conservative Legal Defense and Education Fund,
    and Institute on the Constitution.        Brian S. Koukoutchos,
    Mandeville, Louisiana; James B. Astrachan, ASTRACHAN GUNST
    THOMAS, P.C., Baltimore, Maryland, for Amici Congress of Racial
    Equality, National Center for Public Policy Research, Project
    21, Pink Pistols, Women Against Gun Control, and The Disabled
    Sportsmen of North America.    Dan M. Peterson, DAN M. PETERSON,
    PLLC, Fairfax, Virginia, for Amici The Law Enforcement Legal
    Defense Fund, Law Enforcement Action Network, Law Enforcement
    Alliance of America, International Law Enforcement Educators and
    Trainers Association, and Western States Sheriffs' Association.
    Jonathan K. Baum, Chicago, Illinois, Mark T. Ciani, KATTEN
    MUCHIN ROSENMAN LLP, New York, New York, for Amici Law Center to
    Prevent Gun Violence and Marylanders to Prevent Gun Violence,
    Inc.   Jonathan E. Lowy, Kelly Sampson, BRADY CENTER TO PREVENT
    GUN VIOLENCE, Washington, D.C.; Elliott Schulder, Suzan F.
    Charlton, Amit R. Vora, Catlin Meade, Stephen Kiehl, COVINGTON &
    BURLING LLP, Washington, D.C., for Amicus Brady Center To
    Prevent Gun Violence.   Barbara D. Underwood, Solicitor General,
    Anisha S. Dasgupta, Deputy Solicitor General, Claude S. Platton,
    Assistant Solicitor General, Eric T. Schneiderman, Attorney
    4
    General of the State of New York, for Amicus State of New York;
    Kamala D. Harris, Attorney General of California, Sacramento,
    California, for Amicus State of California; George Jepsen,
    Attorney General of Connecticut, Hartford, Connecticut, for
    Amicus State of Connecticut; Russell A. Suzuki, Attorney General
    of Hawaii, Honolulu, Hawaii, for Amicus State of Hawaii; Lisa
    Madigan, Attorney General of Illinois, Chicago, Illinois, for
    Amicus State of Illinois; Thomas J. Miller, Attorney General of
    Iowa, Des Moines, Iowa, for Amicus State of Iowa; Martha
    Coakley,    Attorney   General    of    Massachusetts,   Boston,
    Massachusetts, for Amicus Commonwealth of Massachusetts; Ellen
    F. Rosenblum, Attorney General of Oregon, Salem, Oregon, for
    Amicus State of Oregon; Karl A. Racine, Attorney General of The
    District of Columbia, Washington, D.C., for Amicus The District
    of Columbia.
    5
    TRAXLER, Chief Judge, wrote the opinion for the court as to
    Parts I, II, and III, in which Judge Agee joined.
    In    April    2013,    Maryland    passed      the   Firearm       Safety   Act
    (“FSA”), which, among other things, bans law-abiding citizens,
    with the exception of retired law enforcement officers, from
    possessing the vast majority of semi-automatic rifles commonly
    kept by several million American citizens for defending their
    families and homes and other lawful purposes.                     Plaintiffs raise
    a number of challenges to the FSA, contending that the “assault
    weapons” ban trenches upon the core Second Amendment right to
    keep firearms in defense of hearth and home, that the FSA’s ban
    of    certain       larger-capacity       detachable        magazines        (“LCMs”)
    likewise violates the Second Amendment, that the exception to
    the   ban   for     retired   officers        violates    the     Equal    Protection
    Clause, and that the FSA is void for vagueness to the extent
    that it prohibits possession of “copies” of the specifically
    identified      semi-automatic     rifles        banned     by    the     FSA.     The
    district court rejected Plaintiffs’ Second Amendment challenges,
    concluding      that    the    “assault       weapons”      and    larger-capacity
    magazine    bans    passed    constitutional       muster       under   intermediate
    scrutiny review.         The district court also denied Plaintiffs’
    equal protection and vagueness claims.
    In our view, Maryland law implicates the core protection of
    the   Second      Amendment—“the    right        of   law-abiding         responsible
    6
    citizens to use arms in defense of hearth and home,” District of
    Columbia         v.    Heller,     
    554 U.S. 570
    ,    635    (2008),    and   we   are
    compelled by Heller and McDonald v. City of Chicago, 
    561 U.S. 742
     (2010), as well as our own precedent in the wake of these
    decisions, to conclude that the burden is substantial and strict
    scrutiny is the applicable standard of review for Plaintiffs’
    Second Amendment claim.                  Thus, the panel vacates the district
    court’s      denial          of   Plaintiffs’            Second       Amendment    claims    and
    remands for the district court to apply strict scrutiny.                                     The
    panel affirms the district court’s denial of Plaintiffs’ Equal
    Protection challenge to the statutory exception allowing retired
    law    enforcement           officers    to     possess         prohibited     semi-automatic
    rifles.      And, the panel affirms the district court’s conclusion
    that       the        term    “copies”         as        used     by     the     FSA    is   not
    unconstitutionally vague.
    I.    Background
    A.
    The FSA substantially expanded Maryland’s gun control laws.
    Prior to passage of the FSA, Maryland law permitted citizens in
    good standing to possess semi-automatic 1 rifles after passing an
    1
    To fire a semi-automatic rifle, the shooter must pull the
    trigger each time he wishes to discharge a round of ammunition.
    In other words, a semi-automatic rifle fires “only one round
    with a single trigger pull. . . . To fire a subsequent round,
    the trigger must be released and pulled again.” J.A. 2254. By
    (Continued)
    7
    extensive background check. 2          The FSA made it a crime after
    October 1, 2013, to “possess, sell, offer to sell, transfer,
    purchase, or receive” or to transport into Maryland any firearm
    designated as an “assault weapon.”            Md. Code, Crim. Law § 4-
    303(a).    Under   the   FSA,    the   term   “assault   weapon”    includes
    “assault   long    gun[s],”     “assault      pistol[s],”     and   “copycat
    weapon[s].”    Id. at § 4-301(d).          Plaintiffs’ challenge in this
    appeal is limited to the ban on “assault long guns,” i.e., most
    semi-automatic rifles.        An “assault long gun” is defined as any
    one of the more than 60 semi-automatic rifle or shotgun models
    specifically   listed    in    section     5-101(r)(2)   of   the   Maryland
    Public Safety Code, see Md. Code, Crim. Law § 4-301(b), “or
    their copies,” Md. Code, Pub. Safety § 5-101(r)(2). 3               The FSA
    contrast, an automatic rifle, like an M-16, will continuously
    discharge rounds “for as long as the trigger [is depressed or]
    until the magazine is empty.”     Id. at 2254-55. No party is
    challenging the ban on automatic weapons.
    2  Pre-ban Maryland law required a prospective purchaser of
    what is now defined as an “assault weapon” to provide
    information such as his “name, address, Social Security number,
    place and date of birth, height, weight, race, eye and hair
    color, signature, driver’s or photographic identification, [and]
    occupation.”   2003 Maryland Laws Ch. 5, § 2.   This information
    is still required under current Maryland law for individuals
    wishing to purchase regulated firearms.     See Md. Code, Pub.
    Safety § 5-118(b)(1).
    3  The term “assault pistol” is defined by reference to a
    list of 15 semi-automatic pistols, specified by make and model.
    See Md. Code, Crim. Law § 4-301(c).    Handguns are categorized
    (Continued)
    8
    does       not   define   the    term   “copies.”        The   list   of    prohibited
    weapons includes the semi-automatic rifle models most popular by
    far among American citizens, the AR-15 “and all imitations” and
    the    semi-automatic           AK-47   “in       all   forms.”       Id.   at   §   5-
    101(r)(2)(ii) and (xv). 4           Anyone who possesses a prohibited semi-
    automatic rifle or otherwise violates the FSA’s restrictions on
    such rifles “is guilty of a misdemeanor” and is subject to a
    separately by the FSA, see Md. Code, Pub. Safety Code § 5-
    101(n)(1) (defining handgun as a “firearm with a barrel less
    than 16 inches in length”), although there certainly are semi-
    automatic handguns not listed as “assault pistols” under the
    FSA.
    “Copycat weapons” are semi-automatic rifles and shotguns
    not specifically listed under section 5-102(r)(2) but similar in
    terms of style and features to the listed weapons.       See Md.
    Code, Crim. Law § 4-301(e)(2) (“‘Copycat weapon’ does not
    include an assault long gun or an assault pistol.”).
    4 Maryland’s law does expressly permit its citizens to
    possess a couple of semi-automatic rifles.       For example, it
    specifically exempts the WWII-era M1 Garand, see Md. Code, Pub.
    Safety § 5-101(r)(2)(xxxvii), and the AR-15 “H-BAR”, see § 5-
    101(r)(2)(xv), a heavy barrel iteration of the AR-15, neither of
    which are popular home defense firearms.     Citizens might also
    legally possess other semi-automatic rifles that are not listed
    under § 5-101(r)(2), presuming the citizen has sufficient
    expertise to determine that the firearm does not constitute a
    “copy” of one of the banned rifles or an “imitation” of the AR-
    15 pattern semi-automatic rifle.   One semi-automatic rifle that
    apparently passes muster is the AR-10, see J.A. 210, a firearm
    that is ill-suited to home defense for some smaller individuals
    because of its heavy recoil which makes it difficult “to
    reobtain the target and to quickly and accurately fire
    subsequent shots if needed.” J.A. 2267.
    9
    prison term of up to three years.                            Md. Code, Crim. Law § 4-
    306(a).
    The     FSA   also     imposed    new        limits      on    the   acquisition           of
    detachable magazines in Maryland.                        Prior to the FSA, Maryland
    law   permitted       the      acquisition             and    transfer     of     detachable
    magazines     with    a    capacity     of        up    to    20    rounds.           See   2002
    Maryland Laws Ch. 26, § 2.                   The FSA now makes it illegal to
    “manufacture,        sell,     offer        for    sale,       purchase,        receive,         or
    transfer a detachable magazine that has a capacity of more than
    10 rounds of ammunition for a firearm.”                            Md. Code, Crim. Law §
    4-305(b). 5     The FSA, however, does not expressly prohibit the
    transportation of magazines holding more than 10 rounds into
    Maryland from out of state, as it does the transportation of
    semi-automatic       rifles.          The    same       penalties      that     apply       to    a
    violation of the statutory prohibitions against semi-automatic
    rifles      apply    to    a   violation           of    the       provisions     regulating
    magazines holding more than 10 rounds.                         See Md. Code, Crim. Law
    § 4-306(a).
    The FSA provides a few exceptions to the ban on possessing
    semi-automatic       rifles      or     LCMs.            For       example,     the    statute
    5  The statute defines a “detachable magazine” as “an
    ammunition feeding device that can be removed readily from a
    firearm without requiring disassembly of the firearm action or
    without the use of a tool, including a bullet or cartridge.”
    Md. Code, Crim. Law § 4-301(f).
    10
    contains a grandfather clause pursuant to which “[a] person who
    lawfully possessed” or “completed an application to purchase” a
    prohibited      semi-automatic         rifle      “before    October       1,    2013”    may
    lawfully continue to “possess and transport” it.                           See Md. Code,
    Crim. Law § 4-303(b)(3)(i).                 And the FSA’s prohibitions do not
    apply    to    several    classes      of    individuals,         such    as    active    law
    enforcement officers and licensed firearms dealers under certain
    circumstances.           See   Md.     Code,      Crim.     Law    §§     4-302(1),      (3).
    Another exception allows retired state or local law enforcement
    agents    to    possess    banned      weapons      and     LCMs    if    the    weapon    or
    magazine was “sold or transferred to the [retired agent] by the
    law    enforcement       agency   on    retirement,”         or     the    retired    agent
    “purchased or obtained” the weapon “for official use with the
    law enforcement agency before retirement.”                         See Md. Code, Crim.
    Law §§ 4-302(7)(i), (ii).
    B.
    Plaintiff Stephen Kolbe is a life-long resident of Maryland
    who resides in Towson and owns a small business in Baltimore
    County.        Kolbe owns “one full-size semiautomatic handgun” that
    is equipped with a standard detachable magazine that holds more
    than    10    rounds.      J.A.      1851.        Various     personal         experiences,
    including       an   incident     in     which      an    employee’s           ex-boyfriend
    threatened to come kill her at work but police did not respond
    for thirty minutes, and Kolbe’s family’s close proximity to “a
    11
    high-traffic public highway,” J.A. 1852, have caused Kolbe to
    conclude    that      he   needs     to   keep      firearms      for    the   purpose    of
    “self-defense in [his] home.”                       J.A. 1851.          But for the ban
    imposed by the FSA, Kolbe would purchase a semi-automatic rifle,
    which “possess[es] features which make[s] [it] ideal for self-
    defense in the home.”            J.A. 1851.
    Plaintiff       Andrew      Turner       is     a    Maryland       resident      who
    currently      owns    three       semi-automatic          rifles,       now   banned     as
    assault weapons under the FSA, and a semi-automatic handgun, all
    of which come with standard detachable magazines holding more
    than 10 rounds.        While on active duty in the United States Navy,
    Turner suffered an injury that makes it difficult for him to
    operate firearms and thus necessitates “access to full-capacity
    magazines . . . to ensure,” among other things, his ability to
    defend himself in his home.               J.A. 1856.        According to Turner, he
    would purchase additional semi-automatic rifles with detachable
    LCMs   if   Maryland       law     did    not       prohibit   him      from   doing     so.
    Turner’s    primary        purpose       for   owning      such    firearms     is    self-
    defense in his home, but he also uses his currently owned semi-
    automatic rifles for target shooting and hunting.
    Finally, Wink’s Sporting Goods, Inc., and Atlantic Guns,
    Inc. -- two businesses that operate in the firearms, hunting,
    and    sport    shooting         industries          --     joined       the   individual
    plaintiffs in challenging the FSA.                         Likewise, several trade,
    12
    hunting       and   gun-owners’         rights        organizations        joined   as
    plaintiffs on their own behalf and on behalf of their members. 6
    Just     before    the     FSA   took    effect     on    October    1,   2013,
    Plaintiffs filed a Motion for a Temporary Restraining Order and
    sought declaratory and injunctive relief, arguing that the ban
    on possession of assault rifles and the 10-round limitation on
    detachable      magazines       abridges      their    rights    under     the   Second
    Amendment;       that     the     exemption     for    retired    law      enforcement
    officers under the FSA violates the Equal Protection Clause of
    the Fourteenth Amendment; and that the term “copies” as it is
    used in section 5-101(r)(2) of Maryland’s Public Safety Code is
    unconstitutionally vague under the Due Process Clause of the
    Fourteenth Amendment.
    After the district court denied Plaintiffs’ Motion for a
    Temporary Restraining Order, the parties filed cross motions for
    summary judgment on the merits.                 The district court determined
    that       intermediate    scrutiny      applied      to   the    Second    Amendment
    claims.       In granting summary judgment to the State, the district
    court      concluded,     under    intermediate       scrutiny,    that    Maryland’s
    ban on “assault” rifles and LCMs met the applicable standards
    and was thus valid under the Second Amendment.                          See Kolbe v.
    6These include Associated Gun Clubs of Baltimore, Inc.;
    Maryland Shall Issue, Inc.; Maryland State Rifle and Pistol
    Association, Inc.; National Shooting Sports Foundation, Inc.;
    and the Maryland Licensed Firearms Dealers Association, Inc.
    13
    O’Malley, 
    42 F. Supp. 3d 768
    , 797 (D. Md. 2014).                         The district
    court also granted summary judgment for the State on Plaintiffs’
    Equal Protection claim to the statutory exception for retired
    law   enforcement     officers,         holding       that   retired    officers    “are
    differently situated” than ordinary citizens who wish to obtain
    assault    rifles.      
    Id. at 798
    .      Finally,     the     district    court
    granted summary judgment for the State on Plaintiffs’ vagueness
    claim based on its conclusion that the ban on possessing assault
    rifles “or their copies” sets forth “an identifiable core of
    prohibited conduct.”         
    Id. at 802
    .
    Plaintiffs appeal.
    II.    Standard of Review
    As we noted above, the district court decided this case on
    cross-motions for summary judgment.                      “When faced with cross-
    motions for summary judgment, we consider each motion separately
    on its own merits to determine whether either of the parties
    deserves    judgment    as    a        matter    of    law.”    Bacon     v.    City   of
    Richmond,    
    475 F.3d 633
    ,        337-38       (4th   Cir.    2007)     (internal
    quotation marks omitted).               In doing so, we apply the ordinary de
    novo standard, while “resolving all doubts and inferences in
    favor of the non-moving party.”                 
    Id.
    Plaintiffs challenge each of the district court’s rulings.
    We address these challenges seriatim.
    14
    III.    Second Amendment
    We turn first to Plaintiffs’ Second Amendment challenge to
    the FSA’s ban on semi-automatic rifles and LCMs.                           The Second
    Amendment, of course, provides that “[a] well regulated Militia,
    being necessary to the security of a free State, the right of
    the people to keep and bear Arms, shall not be infringed.”                          In
    United States v. Chester, we fashioned a two-part approach to
    resolving Second Amendment challenges, see 
    628 F.3d 673
    , 680
    (4th Cir. 2010), much like the approach adopted by several of
    our sister circuits in the wake of Heller, see, e.g., Fyock v.
    Sunnyvale, 
    779 F.3d 991
    , 996 (9th Cir. 2015); Ezell v. City of
    Chicago,       
    651 F.3d 684
    ,   701-03      (7th    Cir.   2011);      Heller   v.
    District of Columbia (“Heller II”), 
    670 F.3d 1244
    , 1252 (D.C.
    Cir. 2011); United States v. Reese, 
    627 F.3d 792
    , 800-01 (10th
    Cir. 2010); United States v. Marzzarella, 
    614 F.3d 85
    , 89 (3d
    Cir. 2010).          First, we ask “whether the challenged law imposes a
    burden    on     conduct     falling   within     the    scope      of   the   Second
    Amendment’s      guarantee.”        Chester,      
    628 F.3d at 680
        (internal
    quotation marks omitted).            The answer to this question requires
    an “historical inquiry” into “whether the conduct at issue was
    understood to be within the scope of the right at the time of
    ratification.”          Id.; see Heller, 
    554 U.S. at 626-27
    .                   If the
    answer to this initial inquiry is no, “the challenged law is
    valid.”         Chester,     
    628 F.3d at 680
    .      However,        “[i]f    the
    15
    challenged regulation burdens conduct that was within the scope
    of the Second Amendment as historically understood, then we move
    to the second step of applying an appropriate form of means-end
    scrutiny.”      
    Id.
    A. Does the FSA’s Ban Implicate Second Amendment Rights?
    We first address the threshold question of whether the bans
    imposed by the FSA burden conduct that falls within the scope of
    the    Second   Amendment.           As    is    now    well     understood,        Heller
    affirmed     that     the    Second       Amendment      protects       a     preexisting
    “individual     right       to   possess     and     carry     weapons      in     case    of
    confrontation.”         
    554 U.S. at 592
    .               “[D]eeply rooted in this
    Nation’s     history    and      tradition,”         McDonald,    
    561 U.S. at 768
    (internal     quotation      marks    omitted),        this    right     is      among    the
    “fundamental rights necessary to our system of ordered liberty,”
    
    id. at 778
    .         The right to keep and bear arms historically has
    been understood to encompass “self-defense and hunting,” Heller,
    
    554 U.S. at 599
    , but Heller made clear “the central component of
    the    Second    Amendment        right”        is    “individual       self-defense,”
    McDonald, 
    561 U.S. at 767
    .                Moreover, the right to keep arms is
    at    its   greatest    strength      in    “the      home,    where     the     need     for
    defense of self, family, and property is most acute.”                              Heller,
    
    554 U.S. at 628
    .
    The FSA makes it unlawful for any citizen “to possess, . .
    . purchase, or receive” an “assault weapon.”                        Md. Code, Crim.
    16
    Law § 4-303(a). 7        The statute prohibits all forms of possession
    of   any      weapon    listed     in       section    5-101(r)(2)—a       law-abiding
    citizen cannot keep any of these weapons in the home for any
    reason, including the defense of self and family.                       Accordingly,
    the conduct being regulated by the FSA includes an individual’s
    possession of a firearm in the home for self-defense.
    The      Supreme     Court       has    already    performed     an     historical
    analysis of our traditional understanding of a citizen’s right
    to keep a weapon at home for self-defense, concluding that “the
    right    of    law-abiding,       responsible         citizens   to    use    arms    in
    defense of hearth and home” lies at the core of the Second
    Amendment.           Heller,    
    554 U.S. at 635
    .   Any      prohibition     or
    restriction imposed by the government on the exercise of this
    right in the home clearly implicates conduct protected by the
    Second Amendment.
    The right to keep and bear arms, as a matter of history and
    tradition, “is not unlimited,” of course, as even law-abiding
    citizens do not have “a right to keep and carry any weapon
    whatsoever in any manner whatsoever and for whatever purpose.”
    
    Id. at 626
    .            Of particular relevance to this appeal is the
    historical limitation upon which arms a citizen had the right to
    bear,    as    the     Second    Amendment        protects   only     “the    sorts   of
    7  The same statutory prohibitions (except as to possession)
    apply to LCMs. See Md. Code, Crim. Law § 4-305(b).
    17
    weapons . . . in common use at the time.”                       Id. at 627 (emphasis
    added)       (internal      quotation       marks   omitted).              “[The    Second
    Amendment] does not extend to all types of weapons, only to
    those    typically       possessed    by     law-abiding        citizens      for   lawful
    purposes.”        Marzzarella,        
    614 F.3d at 90
    .       This     limitation
    reflects “the historical tradition of prohibiting the carrying
    of   dangerous     and    unusual     weapons.”           
    Id.
       (internal      quotation
    marks omitted; emphasis added).
    Moreover,      when     the      regulated     conduct         relates       to     a
    particular class of weapons, we must address an additional issue
    before    we    can   say    with    assurance      that     the     Second    Amendment
    applies and turn to the question of the appropriate level of
    scrutiny.        That is, we must determine whether the particular
    class    of    weapons    prohibited       or    regulated      by   the    statute      are
    themselves protected by the Second Amendment.                         See Friedman v.
    City    of     Highland     Park,    
    784 F.3d 406
    ,    414      (7th    Cir.    2015)
    (Manion, J., dissenting) (“[W]here, as here, the activity is
    directly tied to specific classes of weapons, we are faced with
    an additional threshold matter:                  whether the classes of weapons
    regulated are commonly used by law-abiding citizens.                                If the
    weapons in question (assault rifles and high-capacity magazines)
    are not commonly used by law-abiding citizens, then our inquiry
    ends as there is no Second Amendment protection . . . .”).
    18
    In United States v. Miller, 
    307 U.S. 174
     (1939), the Court
    rejected     a   Second      Amendment         challenge        to     the     defendants’
    convictions for unlawful possession of a short-barreled shotgun
    because there was no “evidence tending to show” that such a
    weapon was related “to the preservation or efficiency of a well
    regulated    militia”        or   was     “part      of    the       ordinary     military
    equipment,” 
    id. at 178
    .              Significantly, however, Miller noted
    that “ordinarily when called for [militia] service [able-bodied]
    men were expected to appear bearing arms supplied by themselves
    and of the kind in common use at the time.”                            
    Id. at 179
    ; see
    Heller, 
    554 U.S. at 624-25
     (“The traditional militia was formed
    from a pool of men bringing arms in common use at the time for
    lawful     purposes     like      self-defense.            In        the     colonial   and
    revolutionary war era, small-arms weapons used by militiamen and
    weapons used in defense of person and home were one and the
    same.”     (internal    quotation         marks      and    alteration          omitted)).
    Reading Miller’s passages together, the Heller Court clarified
    Miller’s holding and explained that “the Second Amendment does
    not protect those weapons not typically possessed by law-abiding
    citizens for lawful purposes, such as short-barreled shotguns.”
    Heller,    
    554 U.S. at 625
       (emphasis       added).          Accordingly,      the
    Second     Amendment    extends         only    to    those      weapons        “typically
    possessed by law-abiding citizens for lawful purposes,” id.; see
    Marzzarella, 
    614 F.3d at 90
     (“[The Second Amendment extends] . .
    19
    . only to those [weapons] typically possessed by law-abiding
    citizens for lawful purposes.”); Heller II, 
    670 F.3d at 1260
    (“[W]e    must    also     ask    whether      the   prohibited     weapons     are
    typically possessed by law-abiding citizens for lawful purposes;
    if not, then they are not the sorts of Arms protected by the
    Second    Amendment.”      (internal        citation   and     quotation      marks
    omitted)); United States v. Fincher, 
    538 F.3d 868
    , 873 (8th Cir.
    2008)    (explaining      there    is     no   protection    for   “weapons     not
    typically possessed by law-abiding citizens for lawful purposes”
    (internal quotation marks omitted)).                 Thus, we must determine
    whether semi-automatic rifles and LCMs are commonly possessed by
    law-abiding citizens for lawful purposes.                   See Fyock, 779 F.3d
    at 998; Heller II, 
    670 F.3d at 1260-61
    .
    Commonly Possessed
    Like a number of courts that have previously considered
    this question, we have little difficulty in concluding that the
    banned semi-automatic rifles are in common use by law-abiding
    citizens.    See, e.g., Heller II, 
    670 F.3d at 1261
     (“We think it
    clear    enough   in     the     record    that   semi-automatic     rifles     and
    magazines holding more than ten rounds are indeed in ‘common
    use,’ as the plaintiffs contend.               Approximately 1.6 million AR–
    15s alone have been manufactured since 1986, and in 2007 this
    one popular model accounted for 5.5 percent of all firearms, and
    14.4    percent   of     all   rifles,     produced    in    the   U.S.   for   the
    20
    domestic market.”); Colorado Outfitters Ass’n v. Hickenlooper,
    
    24 F. Supp. 3d 1050
    ,   1068   (D.       Colo.    2014)     (concluding        that
    statute “affects the use of firearms that are both widespread
    and commonly used for self-defense,” in view of the fact that
    “lawfully owned semi-automatic firearms using a magazine with
    the capacity of greater than 15 rounds number in the tens of
    millions”); Shew v. Malloy, 
    994 F. Supp. 2d 234
    , 246 (D. Conn.
    2014) (concluding that semi-automatic rifles such as the AR-15
    as well as magazines with a capacity greater than 10 rounds “are
    ‘in common use’ within the meaning of Heller and, presumably,
    used for lawful purposes”).             We make the assessment based on the
    present-day use of these firearms nationwide.                      See, e.g., Heller
    II,    
    670 F.3d at 1261
       (looking        to     present-day    use    to    assess
    common use); United States v. Tagg, 
    572 F.3d 1320
    , 1326 (11th
    Cir. 2009) (same); United States v. Fincher, 
    538 F.3d 868
    , 874
    (8th Cir. 2008) (same)
    We think it is beyond dispute from the record before us,
    which      contains      much    of   the        same     evidence     cited       in   the
    aforementioned        decisions,      that       law-abiding       citizens    commonly
    possess semi-automatic rifles such as the AR-15.                         Between 1990
    and 2012, more than 8 million AR- and AK-platform semi-automatic
    rifles alone were manufactured in or imported into the United
    States.      J.A. 1877.          In 2012, semi-automatic sporting rifles
    accounted for twenty percent of all retail firearms sales.                              J.A.
    21
    1880.     For perspective, we note that in 2012, the number of AR-
    and AK-style weapons manufactured and imported into the United
    States was more than double the number of Ford F-150 trucks
    sold, the most commonly sold vehicle in the United States.                      J.A.
    1878.
    Likewise, the record in this case shows unequivocally that
    LCMs are commonly kept by American citizens, as there are more
    than    75    million     such   magazines     in   circulation     in   the   United
    States.       In fact, these magazines are so common that they are
    standard.            “[O]n   a     nationwide       basis   most     pistols     are
    manufactured with magazines holding ten to 17 rounds.”                           J.A.
    2122.        Even more than 20 years ago, “fully 18 percent of all
    firearms owned by civilians . . . were equipped with magazines
    holding more than ten rounds.”                 Heller II, 
    670 F.3d at 1261
    .
    Virtually every federal court to have addressed this question
    has concluded that “magazines having a capacity to accept more
    than ten rounds are in common use.”                 Fyock v. City of Sunnyvale,
    
    25 F. Supp. 3d 1267
    ,   1275   (N.D.      Cal.   2014)    (noting     such
    magazines comprise “approximately 47 percent of all magazines
    owned” and number “in the tens-of-millions, even under the most
    conservative         estimates”    (internal        quotation   marks     omitted),
    aff’d, 
    779 F.3d 991
    , 998 (9th Cir. 2015) (“[W]e cannot say that
    the district court abused its discretion by inferring from the
    evidence of record that, at a minimum, magazines are in common
    22
    use.”).     “There may well be some capacity above which magazines
    are   not   in    common     use     but,    if    so,    the   record       is   devoid   of
    evidence     as   to   what      that       capacity      is;   in     any    event,    that
    capacity surely is not ten.”                 Heller II, 
    670 F.3d at 1261
    ; see
    also Shew, 994 F. Supp. 2d at 245-46; New York State Rifle &
    Pistol Ass’n, Inc. v. Cuomo, 
    990 F. Supp. 2d 349
    , 365 (W.D.N.Y.
    2013).
    In addition, we reject the State’s argument that the Second
    Amendment     does     not      apply       to     detachable        magazines      because
    magazines are not firearms—that is, detachable magazines do not
    constitute “bearable” arms that are expressly protected by the
    Second Amendment.           See U.S. Const. amend. II.                       By Maryland’s
    logic, the government can circumvent Heller, which established
    that the State cannot ban handguns kept in the home for self-
    defense,      simply       by      prohibiting         possession        of       individual
    components of a handgun, such as the firing pin.                         But of course,
    without     the   ability       to   actually      fire    a    gun,    citizens     cannot
    effectively exercise the right to bear arms.                             See Jackson v.
    City of San Francisco, 
    746 F.3d 953
    , 967 (9th Cir. 2014) (“The
    Second Amendment protects ‘arms,’ ‘weapons,’ and ‘firearms’; it
    does not explicitly protect ammunition.                         Nevertheless, without
    bullets, the right to bear arms would be meaningless.”).                             In our
    view, “the right to possess firearms for protection implies a
    corresponding      right”       to   possess       component     parts       necessary     to
    23
    make    the    firearms     operable.        
    Id.
        (internal          quotation      marks
    omitted); see Ezell, 651 F.3d at 704 (“The right to possess
    firearms for protection implies a corresponding right to . . .
    maintain proficiency in their use; the core right wouldn’t mean
    much    without       the      training      and      practice         that      make     it
    effective.”).
    This reasoning applies to the magazines in question.                                To
    the extent that firearms equipped with detachable magazines are
    commonly possessed by law-abiding citizens for lawful purposes,
    there must also be an ancillary right to possess the magazines
    necessary to render those firearms operable.                         To the extent the
    State    can    regulate      these      magazines,      it     is    not    because      the
    magazines      are   not    bearable      “arms”   within       the    meaning       of   the
    Second Amendment.
    Our conclusion that these magazines constitute “arms” also
    finds      strong    historical       support.          Heller        looked    to    early
    definitions of “arms” to determine what weapons implicated the
    Second Amendment, and those definitions were broad, including
    “weapons of offence, or armour of defence,” or anything “that a
    man . . . takes into his hands, or useth in wrath to cast at or
    strike another.”           Heller, 
    554 U.S. at 581
    .                  Other dictionaries
    of   the     time    say    the   same.      See,       e.g.,    Nathan        Bailey,     An
    Universal      Etymological       English    Dictionary         47    (1756)    (defining
    “arm”   as     “to   furnish      with   armour    of    defense,       or     weapons    of
    24
    offence”).      Obviously, magazines and the rounds they contain are
    used to strike at another and inflict damage.                             Early American
    provisions      protecting      the    right       to    “arms”    were       also     crafted
    partly in response to British measures that, while not taking
    away    guns    entirely,       drastically         impaired       their       utility      --
    suggesting      “arms”    should      be    read    to    protect       all    those    items
    necessary to use the weapons effectively.                    See Saul Cornell, The
    Early American Origins of the Modern Gun Control Debate: The
    Right   to     Bear   Arms,     Firearms     Regulation,          and    the    Lessons    of
    History, 17 Stan. L. & Pol’y Rev. 571, 577 (2006) (describing
    British      efforts     to    steal       colonial       Williamsburg’s          store     of
    gunpowder, thereby rendering the firearms of citizens useless).
    In short, magazines and other forms of ammunition have long been
    recognized as arms.
    Lawful Purposes
    Plaintiffs Kolbe and Turner both seek to acquire and keep
    semi-automatic        rifles,     equipped         with    LCMs,        in     their     homes
    primarily      for     self-defense.             And,     they    proffered          evidence
    suggesting that they are not alone in this regard.                             For example,
    Plaintiffs’      expert       James    Curcuruto        presented       survey       evidence
    showing that self-defense was a primary reason for the purchase
    of weapons banned under the FSA, and a 1989 Report from the
    Bureau of Alcohol, Tobacco, and Firearms indicated that self-
    defense was a suitable purpose for semi-automatic rifles.                                 The
    25
    State’s expert Daniel Webster even agreed that it is reasonable
    to    assume    that     a    purpose         for    keeping        one   of    the       prohibited
    weapons is self-defense in the home.
    The State argues that even if ownership of the prohibited
    weapons and magazines is common, nothing in the record reflects
    that these weapons are commonly used for self-defense.                                          More
    specifically, the State’s position is premised on Plaintiffs’
    lack of evidence that the banned semi-automatic rifles have ever
    actually been used in self-defense in Maryland, as opposed to
    being possessed for self-defense.
    The State’s position flows from a hyper-technical, out-of-
    context parsing of the Supreme Court’s statement in Heller “that
    the sorts of weapons protected were those in common use at the
    time.”         Heller,       
    554 U.S. at 627
           (emphasis       added;      internal
    quotation marks omitted).                     The State misreads Heller, as Second
    Amendment rights do not depend on how often the semi-automatic
    rifles   or     regulated          magazines         are      actually       used    to    repel    an
    intruder.        The     proper         standard         under      Heller     is    whether       the
    prohibited      weapons       and       magazines            are   “typically        possessed      by
    law-abiding citizens for lawful purposes” as a matter of history
    and   tradition,       
    id. at 625
        (emphasis           added),     not    whether      the
    magazines are often actually employed in self-defense incidents.
    Actual    use    in    self-defense             is       a   poor    measure        of    whether    a
    particular       firearm           is    “typically            possessed        by       law-abiding
    26
    citizens” for self-defense, as it is unlikely most people will
    ever need to actually discharge a firearm in self-defense.                            See
    Fyock, 25 F. Supp. 3d at 1276 (“The fact that few people will
    require a particular firearm to effectively defend themselves
    should be celebrated and not seen as a reason to except [that
    firearm] from Second Amendment protection.                      Evidence that such
    magazines are typically possessed by law-abiding citizens for
    lawful purposes is enough.”).
    More     importantly,       it    is       the      government’s     burden      to
    establish that a particular weapon or activity falls outside the
    scope of the Second Amendment right.                       See Ezell, 651 F.3d at
    702-03 (“[I]f the government can establish that a challenged
    firearms law regulates activity falling outside the scope of the
    Second   Amendment       right   as    it    was    understood    at     the    relevant
    historical      moment—1791       or   1868—then          the   analysis       can   stop
    there.”).      So far as we can tell, nothing in the record suggests
    any   such    tradition    with    respect         to   semi-automatic      rifles     or
    LCMs.    In fact, the Supreme Court, in a pre-Heller decision,
    hinted   at    the   opposite,     stating         that    “certain    categories      of
    guns,” such as “machineguns, sawed-off shotguns, and artillery
    pieces,”      have   a    “quasi-suspect           character,”    but      that      “guns
    falling outside those categories traditionally have been widely
    accepted as lawful possessions.”                 Staples v. United States, 
    511 U.S. 600
    , 611-12 (1994).               Heller reiterated that “the Second
    27
    Amendment does not protect those weapons not typically possessed
    by   law-abiding        citizens      for      lawful      purposes,     such         as     short-
    barreled shotguns.”           
    554 U.S. at 625
     (emphasis added).
    We    find    nothing     in      the    record       demonstrating            that    law-
    abiding      citizens        have     been          historically        prohibited            from
    possessing semi-automatic rifles and LCMs.                            See Friedman, 784
    F.3d    at   418     (Manion,    J.,      dissenting)            (“[O]utside       of       weapons
    deemed dangerous or unusual, there is no historical tradition
    supporting         wholesale        prohibitions            of     entire         classes       of
    weapons.”).         In fact, semi-automatic firearms have been in use
    by     the    civilian        population            for     more      than        a     century.
    “[I]nitially called ‘self-loading’ or ‘auto-loading’ firearms,”
    J.A.    2254,       semi-automatic        weapons         with     detachable          magazines
    started to see significant advancements in the late 1800s.                                      In
    1893, the “Brochardt semi-auto pistol” was developed for the
    civilian market.             J.A. 2255.          In 1905, Winchester produced a
    semi-automatic rifle, equipped with either a five- or ten-round
    detachable magazine.            And, in 1963, Colt produced the SP-1 semi-
    automatic rifle with a 20-round detachable magazine, later known
    as     the   AR-15,      a    semi-automatic              counterpart       to        the    fully
    automatic       M-16.    There      is    no     record      evidence        or       historical
    documentation that these weapons were at all prohibited until
    relatively recently.
    Dangerous and Unusual Weapons
    28
    Finally, the State argues that the banned semi-automatic
    rifles    are   “unusually      dangerous”    and    therefore      do   not   fall
    within the ambit of the Second Amendment.                 Heller makes clear
    that “dangerous and unusual” weapons are not “weapons typically
    possessed by law-abiding citizens for lawful purposes” that have
    some degree of Second Amendment protection.                   But because all
    firearms are dangerous by definition, the State reasons that
    Heller must mean firearms that are “unusually dangerous” fall
    altogether outside of the scope of the Second Amendment.                        The
    State views the banned guns and LCMs as “unusually dangerous,”
    rendering the Second Amendment inapplicable to the ban.
    The State’s novel “unusually dangerous” standard reads too
    much into Heller.           As best we can tell, no statute or case has
    mentioned,      much   less     adopted,    the     State’s   newly      proffered
    standard.
    In     distinguishing        between     protected       and     unprotected
    weapons, Heller focused on whether the weapons were typically or
    commonly possessed, not whether they reached or exceeded some
    undefined    level     of    dangerousness.       Hand   grenades,       sawed-off
    shotguns and fully automatic “M-16 rifles and the like,” Heller,
    
    554 U.S. at 627
    , are unusual weapons that fall outside of the
    Second Amendment because they are not in common use or typically
    possessed by the citizenry, see id.; Fincher, 
    538 F.3d at 874
    (“Machine guns are not in common use by law-abiding citizens for
    29
    lawful   purposes     and    therefore         fall   within     the    category    of
    dangerous and unusual weapons that the government can prohibit
    for individual use.”).
    Nothing in Heller suggests that courts considering a Second
    Amendment challenge must decide whether a weapon is “unusually
    dangerous.”       Moreover, the difficulties that would arise from
    the application of such a standard are fairly apparent.                      How is
    a   court    to    determine      which    weapons       are    too    dangerous    to
    implicate the Second Amendment?                  The district court believed
    that semi-automatic rifles with LCMs are too dangerous based on
    evidence that they unleash greater destructive force than other
    firearms and appear to be disproportionately connected to mass
    shootings.        But if the proper judicial standard is to go by
    total murders committed, then handguns should be considered far
    more dangerous than semi-automatic rifles.                      “[M]ost murders in
    America are committed with handguns.                  No other weapon is used
    nearly as often.         During 2006, handguns were used in 60% of all
    murders while long guns . . . were used only in 7%.”                        Carl T.
    Bogus,   Gun      Control   &     America’s      Cities:         Public    Policy    &
    Politics,     1   Alb.    Gov’t    L.     Rev.    440,    447    (2008)    (footnote
    omitted).      And, the use of handguns in the number of overall
    homicides is out of proportion to the ownership of handguns.
    See id. at 447 (“[A]mong the 192 million guns in America only
    35% are handguns. . . [H]andguns are used in 88% of all firearm
    30
    murders.” (footnote omitted)).                   Yet Heller has established that
    handguns are constitutionally protected and therefore cannot be
    too dangerous for Second Amendment purposes.
    Furthermore,        Heller     refers       to    “dangerous”         and    “unusual”
    conjunctively, suggesting that even a dangerous weapon may enjoy
    constitutional protection if it is widely employed for lawful
    purposes, i.e., not unusual.                     Founding era understandings of
    what it means for something to be “unusual” reflect that the
    firearm must be rare to be considered “unusual.”                                   See Samuel
    Johnson,     A     Dictionary       of     the     English        Language        717    (1768)
    (defining        “unusual”    as      “not       common:        not    frequent:         rare”);
    Bailey, supra, at 641 (defining “unusualness” as “rareness, and
    uncommonness”); accord Peruta v. Cnty. of San Diego, 
    742 F.3d 1144
    , 1154 (9th Cir. 2014) (suggesting that laws applicable to
    “dangerous        and    unusual”        weapons        were     “understood        to     cover
    carriage    of     uncommon,       frightening          weapons        only”).          Scholars
    often read “unusual” in the same way.                      See, e.g., Jordan Pratt,
    Uncommon Firearms as Obscenity, 
    81 Tenn. L. Rev. 633
    , 637 (2014)
    (equating        “dangerous     and       unusual”        firearms         with    “uncommon”
    ones”); Dan Terzian, The Right to Bear (Robotic) Arms, 
    117 Penn St. L. Rev. 755
    , 767 (2013) (“Most likely, common use is the
    sole   limiting         principle.”).        If     the        firearm     in     question    is
    commonly     possessed       for    lawful        purposes,           it   certainly      isn’t
    “rare” and thereby “unusual.”                See, e.g., Fyock, 
    25 F. Supp. 3d 31
    at 1275 (“To measure whether a weapon is dangerous and unusual,
    the court looks at whether it is in common use . . . .”); In re
    Wheeler,      
    81 A.3d 728
    ,   750    (N.J.      App.    Div.     2013)    (“[T]he
    protection was not understood to extend to the keeping, carrying
    or using of weapons that were deemed dangerous or unusual, in
    the sense that they were not typically used by the law-abiding
    and responsible for lawful purposes.”).                      Indeed, it was only a
    dissent    in      Heller    that   focused     on   dangerousness      alone.      See
    Heller, 
    554 U.S. at 711
     (Breyer, J., dissenting).                             Thus, the
    State’s “unusually dangerous” argument is of no avail.                         Our good
    colleague in dissent would not reach this issue and therefore
    assumes for analytical purposes that semi-automatic rifles like
    the   AR-15     are    not    “dangerous      and    unusual”    but    are    commonly
    possessed by law-abiding citizens for lawful purposes. 8
    In sum, semi-automatic rifles and LCMs are commonly used
    for lawful purposes, and therefore come within the coverage of
    the Second Amendment. 9
    8 Although the dissent faults our conclusion that the AR-15
    and other semi-automatic rifles prohibited by Maryland law are
    not so “dangerous and unusual” that they fall outside of the
    scope of the Second Amendment, the dissent does not rest on
    unusual dangerousness grounds.
    9  Plaintiffs go too far in arguing that once we determine
    that the prohibited firearms fall within the protective ambit of
    the Second Amendment, the Act is unconstitutional and our
    analysis is at an end.      Although Heller indicated that the
    District of Columbia’s ban on keeping operable handguns in the
    home would fail any level of constitutional scrutiny, Heller did
    (Continued)
    32
    B.   Appropriate Level of Scrutiny
    Having   determined    that   the   Second   Amendment     covers   the
    prohibited semi-automatic rifles, we next consider whether the
    district court erred in applying intermediate scrutiny.
    We first consider which of the two relevant standards of
    scrutiny (strict or intermediate scrutiny) should apply. 10              The
    strict-scrutiny standard requires the government to prove its
    restriction   is    “narrowly   tailored    to    achieve   a   compelling
    not do away with means-end scrutiny for Second Amendment
    challenges.   Heller simply found it unnecessary to decide the
    applicable level of scrutiny because a ban of handguns, the
    overwhelming choice of Americans for home defense, was clearly
    unconstitutional regardless of the standard applied. See Heller
    II, 
    670 F.3d at 1265
     (“If the Supreme Court truly intended to
    rule out any form of heightened scrutiny for all Second
    Amendment cases, then it surely would have said at least
    something to that effect.”).   Accordingly, in most every post-
    Heller case implicating the Second Amendment, we have assumed
    that “an appropriate form of means-end scrutiny” will be applied
    once we determine that a challenged law implicates the Second
    Amendment. See United States v. Pruess, 
    703 F.3d 242
    , 245 (4th
    Cir. 2012); United States v. Carpio-Leon, 
    701 F.3d 974
    , 978 (4th
    Cir. 2012); United States v. Carter (“Carter I”), 
    669 F.3d 411
    ,
    416 (4th Cir. 2012); United States v. Chapman, 
    666 F.3d 220
    , 225
    (4th Cir. 2012); United States v. Staten, 
    666 F.3d 154
    , 158 (4th
    Cir. 2011); Chester II, 
    628 F.3d at 678
    .     Unless the Supreme
    Court directs us to the contrary, we will apply “an appropriate
    means-end scrutiny” to determine whether firearm regulations can
    apply to acts coming under the protection of the Second
    Amendment.
    10 In a Second Amendment challenge, we will not conduct
    rational-basis review.   See Heller, 
    554 U.S. at
    628 n.27 (“If
    all that was required to overcome the right to keep and bear
    arms was a rational basis, the Second Amendment would be
    redundant with the separate constitutional prohibitions on
    irrational laws, and would have no effect.”).
    33
    governmental        interest.”          Abrams     v.   Johnson,      
    521 U.S. 74
    ,   82
    (1997); see Citizens United v. Federal Election Comm’n, 
    558 U.S. 310
    ,    340       (2010)     (explaining     strict          scrutiny      “requires        the
    Government to prove that the restriction furthers a compelling
    interest      and    is    narrowly      tailored       to    achieve      that   interest”
    (internal quotation marks omitted)).                         To be narrowly tailored,
    the law must employ the least restrictive means to achieve the
    compelling government interest.                    See United States v. Playboy
    Entertainment           Group,     Inc.,     
    529 U.S. 803
    ,      813     (2000).
    Conversely,         intermediate        scrutiny    requires         the    government      to
    “demonstrate . . . that there is a reasonable fit between the
    challenged regulation and a substantial government objective.”
    Chester, 
    628 F.3d at 683
    .               For several reasons, we find that the
    Act’s firearms and magazine bans require strict scrutiny.
    In Chester, we adopted a First-Amendment-like approach to
    determining the appropriate level of scrutiny to apply to any
    given Second Amendment challenge.                  To select the proper level of
    scrutiny, we consider “the nature of the conduct being regulated
    and the degree to which the challenged law burdens the right.”
    
    628 F.3d at 682
    .           “A less severe regulation -- a regulation that
    does   not        encroach    on   the    core     of    the     Second     Amendment       --
    requires      a    less    demanding      means-ends         showing.”        Nat’l    Rifle
    Ass’n of Am., Inc. v. Bureau of Alcohol, Tobacco & Firearms, 
    700 F.3d 185
    ,       195     (5th   Cir.    2012);     see       also   United       States    v.
    34
    Huitron-Guizar, 
    678 F.3d 1164
    , 1166 (10th Cir. 2012) (“The right
    to bear arms, however venerable, is qualified by what one might
    call the ‘who,’ ‘what,’ ‘where,’ ‘when,’ and ‘why.’”).
    First, the FSA’s ban on semi-automatic rifles and larger-
    capacity magazines burdens the availability and use of a class
    of   arms   for    self-defense      in   the    home,          where   the     protection
    afforded    by     the   Second   Amendment       is       at    its    greatest.        It
    implicates the “core” of the Second Amendment: “the right of
    law-abiding,       responsible    citizens       to    use       arms    in   defense    of
    hearth and home.”         Heller, 
    554 U.S. at 634, 635
    ; see Kachalsky
    v. County of Westchester, 
    701 F.3d 81
    , 89 (2d Cir. 2012) (“What
    we   know   from    [Heller   and    McDonald]        is    that       Second    Amendment
    guarantees are at their zenith within the home.”).                               At stake
    here is a “basic right,” McDonald, 
    561 U.S. at 767
    , “that the
    Framers and ratifiers of the Fourteenth Amendment counted . . .
    among   those      fundamental      rights      necessary         to    our     system   of
    ordered liberty,” 
    id. at 778
    .                  Indeed, “[t]he [Supreme] Court
    [in Heller] went to great lengths to emphasize the special place
    that the home—an individual's private property—occupies in our
    society.”        GeorgiaCarry.Org, Inc. v. Georgia, 
    687 F.3d 1244
    ,
    1259 (11th Cir. 2012).
    Second, we conclude that the challenged provisions of the
    FSA substantially burden this fundamental right.                                The burden
    imposed in this case is not merely incidental.                             Maryland law
    35
    imposes a complete ban on the possession by law-abiding citizens
    of AR-15 style rifles—the most popular class of centerfire semi-
    automatic      rifles      in   the   United      States.        As    we   explained     in
    Section III.A., these weapons are protected under the Second
    Amendment.         We    therefore      struggle     to    see   how     Maryland’s      law
    would not substantially burden                  the core Second Amendment right
    to defend oneself and one’s family in the home with a firearm
    that    is    commonly      possessed      by     law-abiding     citizens        for   such
    lawful purposes.           Moreover, the FSA also reaches every instance
    where an AR-15 platform semi-automatic rifle or LCM might be
    preferable         to    handguns     or    bolt-action          rifles--for       example
    hunting,      recreational        shooting,         or    competitive       marksmanship
    events,      all    of    which   are      lawful    purposes         protected    by    the
    Constitution.           See Friedman v. City of Highland Park, 
    136 S. Ct. 447
     (Mem.) (December 7, 2015) (Thomas, J., dissenting from the
    denial of cert.) (“[T]he ordinance criminalizes modern sporting
    rifles       (e.g.,      AR-style     semiautomatic          rifles),        which      many
    Americans own for lawful purposes like self-defense, hunting,
    and target shooting.”).                 Thus, the FSA completely prohibits,
    not just regulates, an entire category of weaponry. 11                            As Judge
    11  Despite my good friend’s contrary suggestion, in
    prohibiting the AR-15 platform or pattern rifles and its copies
    or imitations, Maryland law is prohibiting   an entire class of
    semi-automatic rifles. Indeed, the district court recognized
    that the Maryland firearm law “remove[s] a class of weapons”
    (Continued)
    36
    Kavanaugh noted in dissent in Heller II, prohibiting this group
    of   weapons         might   be       “equivalent   to   a   ban   on    a    category    of
    speech.”       
    670 F.3d at 1285
    .
    Contrary to the district court’s conclusion, the fact that
    handguns, bolt-action and other manually-loaded long guns, and,
    as     noted     earlier,         a     few   semi-automatic       rifles      are     still
    available for self-defense does not mitigate this burden.                               See,
    e.g., Jackson v. City & Cnty. of San Fran., 
    135 S. Ct. 2799
    ,
    2801     (2015)        (Thomas,         J.,   dissenting     from       the    denial    of
    certiorari) (“[N]othing in our decision in Heller suggested that
    a law must rise to the level of the absolute prohibition at
    issue in that case to constitute a ‘substantial burden’ on the
    core of        the    Second      Amendment     right.”).      Indeed,        the    Supreme
    Court rejected essentially the same argument in Heller—that the
    District of Columbia’s handgun ban did not unconstitutionally
    that the plaintiffs want for home defense.     J.A. 181 (emphasis
    added).   Even the State’s expert witness refers to the “AR-15
    class” of firearms. J.A. 438, Modern sporting rifles using the
    AR-15 platform or pattern are produced by numerous manufacturers
    including Colt, Olympic Arms, DPMS, Eagle Arms, Bushmaster, SGW
    Enterprises, Essential Arms, and Sendra.        Although the FSA
    specifically lists the “Colt AR-15” as a prohibited weapon, the
    AR-15   style    semi-automatic   rifles   produced     by   other
    manufacturers would be prohibited as copies or imitations under
    Md. Code, Pub. Safety § 5-101(r)(2)(xv).    See Friedman v. City
    of Highland Park, 
    136 S. Ct. 447
     (Mem.) (December 7, 2015)
    (Thomas, J., dissenting from the denial of cert.) (describing
    similar   “Assault   Weapons”   ordinance   as    “categorical[ly]
    ban[ning] . . . firearms that millions of Americans commonly own
    for lawful purposes”); see also J.A. 413.
    37
    burden the right to self-defense because the law permitted the
    possession of long guns for home defense.                        See Heller, 
    554 U.S. at 629
     (“It is no answer to say, as petitioners do, that it is
    permissible to ban the possession of handguns so long as the
    possession of other firearms (i.e., long guns) is allowed.”);
    accord Parker v. District of Columbia, 
    478 F.3d 370
    , 400 (D.C.
    Cir. 2007) (rejecting the District’s argument that alternative
    weapons rendered handgun ban lawful, calling it “frivolous,” and
    noting that “[i]t could be similarly contended that all firearms
    may    be    banned     so    long       as    sabers      were     permitted”);        cf.
    Southeastern        Promotions,      Ltd.      v.    Conrad,      
    420 U.S. 546
    ,    556
    (1975)      (“[O]ne    is    not   to    have       the   exercise       of   liberty   of
    expression in appropriate places abridged on the plea that it
    may be exercised in some other place.”).                     A semi-automatic rifle
    may not be “the quintessential self-defense weapon,” as Heller
    described     the     handgun,     
    554 U.S. at 629
    ;    nonetheless,     as   we
    explained previously, AR-15s and the like are commonly possessed
    by    law-abiding      citizens      for       self-defense        and    other   lawful
    purposes and are protected under the Second Amendment.
    There are legitimate reasons for citizens to favor a semi-
    automatic rifle over handguns in defending themselves and their
    families at home.           The record contains evidence suggesting that
    “handguns are inherently less accurate than long guns” as they
    “are more difficult to steady” and “absorb less of the recoil .
    38
    .   .   ,   reducing   accuracy.”         J.A.    2131.      This     might   be   an
    important consideration for a typical homeowner, who “under the
    extreme duress of an armed and advancing attacker is likely to
    fire at, but miss, his or her target.”               J.A. 2123.       “Nervousness
    and     anxiety,    lighting    conditions,       the     presence    of   physical
    obstacles . . . and the mechanics of retreat are all factors
    which contribute to [the] likelihood” that the homeowner will
    shoot at but miss a home invader.                 J.A. 2123.         These factors
    could also affect an individual’s ability to reload a firearm
    quickly during a home invasion.                Similarly, a citizen’s ability
    to defend himself and his home is enhanced with an LCM.
    In sum, for a law-abiding citizen who, for whatever reason,
    chooses to protect his home with a semi-automatic rifle instead
    of a semi-automatic handgun, or possesses an LCM for use in
    firearms kept in the home, the FSA significantly burdens the
    exercise of the right to arm oneself at home.                        “The right to
    self-defense is largely meaningless if it does not include the
    right to choose the most effective means of defending oneself.”
    Friedman, 784 F.3d at 418 (Manion, J., dissenting); see id. at
    413     (“[T]he    ultimate    decision    for    what    constitutes      the   most
    effective means of defending one’s home, family, and property
    resides in individual citizens and not the government. . . .
    The extent of danger—real or imagined—that a citizen faces at
    home is a matter only that person can assess in full.”).                           The
    39
    FSA “restrict[s] the right[] of [Maryland’s] citizens to select
    the means by which they defend their homes and families.”                Id.
    at 419.
    As we have noted on previous occasions, “any law that would
    burden the ‘fundamental,’ core right of self-defense in the home
    by a law-abiding citizen would be subject to strict scrutiny.
    But, as we move outside the home, firearm rights have always
    been more limited.”      United States v. Masciandaro, 
    638 F.3d 458
    ,
    470 (4th Cir. 2011).        “[T]his longstanding out-of-the-home/in-
    the-home distinction bears directly on the level of scrutiny
    applicable,”     
    id.,
       with   strict      scrutiny   applying      to   laws
    restricting the right to self-defense in the home, see Woollard
    v. Gallagher, 
    712 F.3d 865
    , 878 (4th Cir. 2013) (observing that
    restrictions on “the right to arm oneself at home” necessitates
    the application of strict scrutiny).          Strict scrutiny, then, is
    the appropriate level of scrutiny to apply to the ban of semi-
    automatic rifles and magazines holding more than 10 rounds.               See
    Friedman, 784 F.3d at 418 (Manion, J., dissenting); cf. Heller
    II, 
    670 F.3d at 1284
     (Kavanaugh, J., dissenting) (reading Heller
    as   departing   from   traditional    scrutiny   standards   but    stating
    that “[e]ven if it were appropriate to apply one of the levels
    of scrutiny after Heller, surely it would be strict scrutiny
    rather than . . . intermediate scrutiny”).
    40
    We   recognize       that    other       courts     have    reached     different
    outcomes when assessing similar bans, but we ultimately find
    those decisions unconvincing.
    The Seventh Circuit, for instance, recently upheld a ban on
    “assault weapons” and LCMs by dispensing with levels of scrutiny
    entirely.     See Friedman, 784 F.3d at 410.                      Instead, that court
    conjured its own test, asking “whether a regulation bans weapons
    that were common at the time of ratification or those that have
    some reasonable relationship to the preservation or efficiency
    of a well regulated militia, and whether law-abiding citizens
    retain adequate means of self-defense.”                    Id. (internal quotation
    marks and citations omitted).                   The Seventh Circuit’s approach
    cannot be reconciled with Heller, which looked to present-day
    use    to   assess      whether         handguns     are     in     common    use     (and
    consequently protected).                See 
    554 U.S. at 629
    ; see also 
    id. at 582
     (“Some have made the argument, bordering on the frivolous,
    that   only   those      arms      in    existence    in    the     18th   century     are
    protected     by      the       Second      Amendment.”           (emphasis     added)).
    Friedman,     on   the      other       hand,    ignores     the     Supreme       Court’s
    specification      of    present-day        focus    and     asks    instead       whether
    certain features of the weapons in question were common at the
    time of the Founding, effectively elevating a Heller dissent to
    constitutional       canon.         Compare      Friedman,    784     F.3d    at    408-09
    (suggesting that present day common use cannot be the relevant
    41
    test because machine guns were in common use when they were
    federally banned in 1934 and are now uncommon because of the
    ban), with     Heller, 
    554 U.S. at 720-21
     (Breyer, J., dissenting)
    (same).
    Friedman’s problems stretch beyond its direct contradiction
    of Heller.     For instance, the Friedman opinion defines the scope
    of the Second Amendment right by reference to militias -- but it
    then declares that states, “which are in charge of militias,”
    should determine what weapons are rightfully held for militia-
    related purposes.        Friedman, 784 F.3d at 410-11.              That course
    effectively permits states to opt-out of the Second Amendment.
    But see McDonald, 
    561 U.S. at 750
     (“[T]he Second Amendment right
    is fully applicable to states.”).             Friedman also concludes that
    the    “dangerousness”    of    the     regulated   weapons      should    not   be
    decisive, Friedman, 784 F.3d at 409, but nevertheless dismisses
    the self-defense-related benefits of those same weapons because
    they    “can   fire   more     shots,    faster,    and   thus    can     be   more
    dangerous in aggregate,” id. at 411.            And it recognizes that the
    restriction must be supported by some genuine state interest,
    but then finds such an interest in the fact that bans might
    “reduce[] the perceived risk from a mass shooting.”                  Id. at 412
    (emphasis added).        In other words, under the Seventh Circuit’s
    view, a significant restriction on a fundamental right might be
    justified by benefits that are quite literally imagined into
    42
    existence.      Needless to say, we see much to question in the
    Seventh Circuit’s decision.
    Two      courts       of   appeal      have     applied     the     standard      of
    intermediate     scrutiny          to    restrictions     like   Maryland’s.           See
    Fyock, 779 F.3d at 999 (applying intermediate scrutiny to an LCM
    ban);   Heller       II,     
    670 F.3d at 1262
       (applying      intermediate
    scrutiny to a semi-automatic weapon and LCM ban).                        Both did so
    after rather conclusorily determining that the bans in those
    cases   did    not     impose      any    significant     burden    on    the    Second
    Amendment right.           For its part, the D.C. Circuit was “reasonably
    certain” that the challenged laws didn’t impose a substantial
    burden, Heller II, 
    670 F.3d at 1262
    , while the Ninth Circuit
    found that the district court did not “abuse [its] discretion”
    at the preliminary injunction stage in finding much the same,
    Fyock, 779 F.3d at 999.
    For example, the D.C. Circuit in Heller II, with de minimis
    analysis,     simply       concluded      that    prohibitions     of    the    arms    in
    question would meet intermediate scrutiny because “the ban on
    certain semi-automatic rifles [does not] prevent a person from
    keeping a suitable and commonly used weapon for protection in
    the home or for hunting[.]”               
    670 F.3d at 332
    .       As noted earlier,
    this genre of judicial conclusion seems plainly contrary to the
    Supreme Court’s logic and statements in Heller: “It is no answer
    to say . . . that it is permissible to ban the possession of
    43
    handguns so long as the possession of other firearms (i.e., long
    guns)    is    allowed.”      
    554 U.S. at 629
    .         Notwithstanding           this
    guidance from the Supreme Court, the Heller II court went on to
    also summarily conclude that “the prohibition of semi-automatic
    rifles and large-capacity magazines does not effectively disarm
    individuals      or   substantially         affect       their    ability         to   defend
    themselves.”      
    670 F.3d at 1262
    .              This holding seems to directly
    contradict      the   Supreme      Court’s       statement       in   Heller       that    the
    Second Amendment “surely elevates above all other interests the
    right    of    law-abiding,        responsible       citizens         to    use    arms    in
    defense of hearth and home.”                
    554 U.S. at 635
    .               Thus, we find
    Heller    II    and   Fyock    without      persuasive          reasoning     and      simply
    incorrect.
    Whatever may be said about the bans at issue in Fyock and
    Heller II, it should be obvious by this point that we view
    Maryland’s ban quite differently.                 A wholesale ban on an entire
    class of common firearms is much closer to the total handgun ban
    at issue in Heller than more incidental restrictions that might
    be   properly    subject      to   intermediate          scrutiny.         The     law    here
    “goes    beyond       mere    regulation”          and     is     instead         “a     total
    prohibition of possession of certain types of arms.”                              Arnold v.
    Cleveland,      
    616 N.E.2d 163
    ,   176      (Ohio        1993)      (Hoffman,      J.,
    concurring in part and dissenting in part) (addressing assault-
    weapons ban); see also Marzzarella, 
    614 F.3d at 97
     (stressing
    44
    that the ban in Heller was subject to most scrutiny because
    “[i]t     did    not        just     regulate          possession          of     handguns;     it
    prohibited it”).             In this way, Maryland’s outright ban on LCMs
    and “assault weapons” is akin to a law that “foreclose[s] an
    entire medium of expression.”                 City of Ladue v. Gilleo, 
    512 U.S. 43
    , 55 (1994).          Such laws receive exceptionally rigorous review
    in the analogous context of the First Amendment, 
    id.,
     and we see
    no reason for a different method here.
    Our distinguished dissenting colleague asserts that we have
    imprudently and unnecessarily broken with our sister courts of
    appeal    and    infers       that    we    will       bear    some       responsibility        for
    future mass shootings.               In our view, inferences of this nature
    have    no   place     in    judicial       opinions          and    we    will    not     respond
    beyond noting this.                The meaning of the Constitution does not
    depend on a popular vote of the circuits and it is neither
    improper      nor     imprudent       for     us       to    disagree       with     the    other
    circuits addressing this issue.                       We are not a rubber stamp.                We
    require      strict    scrutiny       here       not    because       it    aligns       with   our
    personal      policy        preferences       but       because       we        believe    it   is
    compelled by the law set out in Heller and Chester.
    Because the district court did not evaluate the challenged
    provisions      of     the    FSA     under      the        proper    standard       of    strict
    scrutiny,       and    the     State       did        not    develop       the     evidence      or
    arguments required to support the FSA under the proper standard,
    45
    we vacate the district court’s order as to Plaintiffs’ Second
    Amendment challenge and remand for the court to apply strict
    scrutiny in the first instance.         This is not a finding that
    Maryland’s law is unconstitutional.        It is simply a ruling that
    the test of its constitutionality is different from that used by
    the   district   court.      The   State   should   be   afforded   the
    opportunity to develop its case in light of this more demanding
    standard, and Plaintiffs should be permitted to do so as well.
    In doing so, the parties may look to “a wide range of sources,
    such as legislative text and history, empirical evidence, case
    law, and common sense, as circumstances and context require.”
    Carter I, 
    669 F.3d at 418
    . 12
    IV. Equal Protection
    12 In light of our decision to remand the Second Amendment
    claim, we need not address Plaintiffs’ arguments that the
    district court committed error by granting summary judgment to
    the State when there were several material facts in dispute,
    and, by the same token, denying summary judgment to Plaintiffs
    when the record contained various undisputed material facts that
    required entry of judgment as a matter of law in favor of
    Plaintiffs.
    Plaintiffs also contest the district court’s denial of
    their motion to exclude expert and fact testimony offered by the
    State. Having carefully considered these arguments, we conclude
    that the district court did not abuse its wide discretion in
    evidentiary matters by denying the motions and considering the
    testimony. See United States v. Min, 
    704 F.3d 314
    , 324-25 (4th
    Cir. 2013) (decisions under Rule of Evidence 701 reviewed for
    abuse of discretion); United States v. Wilson, 
    484 F.3d 267
    , 273
    (4th Cir. 2007) (Rule of Evidence 702).
    46
    AGEE, Circuit Judge, wrote a separate opinion as to Part IV, in
    which Judge King concurred in the judgment:
    The Equal Protection Clause guarantees that no state shall
    “deny to any person within its jurisdiction the equal protection
    of the laws.”            U.S. Const. amend. XIV, § 1. 13                       It does not
    follow,      however,       that    all      classifications             are    forbidden.
    Instead,      the   Equal    Protection       Clause       is    designed       to    “keep[]
    governmental        decisionmakers        from     treating       differently         persons
    who are in all relevant respects alike.”                          Nordlinger v. Hahn,
    
    505 U.S. 1
    ,   10    (1992).       In    our        view,    the    district          court
    correctly      determined      that     retired          police     officers         are    not
    similarly situated with the public at large for purposes of the
    Maryland Firearm Safety Act (“FSA”).                      Therefore, granting those
    officers certain rights under the FSA does not violate the Equal
    Protection Clause.
    A.
    1.
    To succeed on an equal-protection claim, “a plaintiff must
    first      demonstrate     that    he   has       been    treated       differently        from
    others with whom he is similarly situated.”                       Sandlands C & D LLC
    v. Cnty. of Horry, 
    737 F.3d 45
    , 55 (4th Cir. 2013).                             “Generally,
    in determining whether persons are similarly situated for equal
    13This portion of the opinion omits internal marks,
    alterations, citations, emphasis, or footnotes from quotations
    unless otherwise noted.
    47
    protection purposes, a court must examine all relevant factors.”
    United   States      v.     Olvis,    
    97 F.3d 739
    ,       744    (4th    Cir.    1996)
    (emphasis added).           The court applies an appropriate level of
    constitutional scrutiny to the challenged governmental act only
    after the plaintiff makes this initial showing of similarity,
    along with a showing that the government acted purposefully or
    intentionally.       Sandlands C & D LLC, 737 F.3d at 55.
    The “similarly situated” standard requires a plaintiff to
    identify    persons       materially       identical      to    him   or     her    who   has
    received different treatment.                 Different courts describe this
    requirement     in    different        ways.        The        Seventh     Circuit,       for
    example,     has     said    that     the     two    compared         groups       must    be
    “identical    or     directly    comparable         in   all     material         respects.”
    LaBella Winnetka, Inc. v. Village of Winnetka, 
    628 F.3d 937
    , 942
    (7th Cir. 2010).          The Eleventh Circuit indicates that different
    groups must be “prima facie identical” to provide the relevant
    comparison.     Grider v. City of Auburn, Ala., 
    618 F.3d 1240
    , 1264
    (11th Cir. 2010).           The First Circuit, meanwhile, takes a more
    colloquial approach, stressing that “apples should be compared
    to apples.”        Barrington Cove Ltd. P’ship v. R.I. Hous. & Mortg.
    Fin. Corp., 
    246 F.3d 1
    , 8 (1st Cir. 2001).                       However the test is
    written, the basic point is the same: the “evidence must show an
    extremely     high    degree     of    similarity.”              Willis      v.    Town    of
    Marshall, N.C., 275 F. App’x 227, 233 (4th Cir. 2008); see also
    48
    LaBella, 
    628 F.3d at 942
     (“The similarly situated analysis is
    not a precise formula, but . . . what is clear is that similarly
    situated individuals must be very similar indeed.”).
    2.
    A retired officer enjoys two privileges under the FSA that
    the public does not.            First, he may possess an “assault weapon”
    as long as it was “sold or transferred to the [officer] by the
    law enforcement agency on retirement” or the officer “purchased
    or    obtained”    it    “for    official       use    with   the    law    enforcement
    agency   before     retirement.”          Md.    Code,      Crim.   Law    §   4-302(7).
    Second, he is not subject to any of the restrictions on larger-
    capacity magazines.        Id. § 4-305(a)(2).
    Exceptions for retired law enforcement officers like these
    are common in firearms regulations.                    See, e.g., 
    Cal. Penal Code §§ 25450
    , 26015; 
    D.C. Code § 7-2502.01
    (a)(2); 
    N.Y. Penal Law § 265.20
    .e    (McKinney          2015);     see        also   Public       Safety      and
    Recreational Firearms Use Protection Act, Pub. L. No. 103-322,
    § 110102(a)(4)(C), 
    108 Stat. 1796
    , 1996 (1994) (repealed 2004).
    But    according    to     Plaintiffs,         the     differentiation         found    in
    Maryland’s law renders the entire FSA unconstitutional.                                See
    Opening Br. 44 n.8.
    B.
    Plaintiffs       argue    that,    when        it   comes    to    owning    semi-
    automatic    weapons      and    larger-capacity           magazines,      retired     law
    49
    enforcement      officers    and    the    public       at    large   are     “similarly
    situated.”    In our view, that argument fails because retired law
    enforcement officers are different from the public in several
    fundamental      respects.        Three    dissimilarities         are    particularly
    relevant.
    1.
    First, retired police officers possess a unique combination
    of training and experience related to firearms.                           See Shew v.
    Malloy, 
    994 F. Supp. 2d 234
    , 252 (D. Conn. 2014); Pineiro v.
    Greene, 
    937 F. Supp. 2d 161
    , 176 (D. Mass. 2013).                         All Maryland
    police officers undergo comprehensive training and qualification
    on their firearms.          See Code of Md. Admin. Regs. 12.04.02.03–
    .10.      This     training       incorporates          live-fire       exercises    and
    academic study.       Moreover, it covers not just how to fire a
    weapon    accurately,        but        also     when     a     given     firearm     is
    appropriately     used,     how    to    minimize       harm,   and     how   to   safely
    store the firearm -- among many other subjects.                          After initial
    qualification,     officers       must    then    undergo       additional     training
    every year.
    The officers do not just participate in some “general” form
    of firearms training.         Rather, the officers that carry assault
    weapons on duty -- and thus, those most likely to obtain those
    weapons upon retirement -- must receive further training and
    certification tests that pertain specifically to those weapons.
    50
    An officer who wishes to carry an AR-15, for instance, must fire
    at    least   350   rounds      of    ammunition    with    that     weapon    during
    initial training and qualification.                See id. 12.04.02.06B(3)(c).
    The   same    officer    must     also   spend    at   least    14    hours   in   the
    classroom discussing the appropriate use of such weapons.                          See
    id. 12.04.02.06B(2)(c).           If an officer fails to meet any one of
    these requirements, he may not carry that weapon.
    On a day-to-day basis, through their years of employment,
    police   officers       gain   further     practical     experience     with    their
    weapons -- experience that few, if any, private civilians can
    claim to possess in equal measure.                For “[u]nlike most employees
    in the workforce, peace officers carry firearms because their
    occupation requires them on occasion to confront people who have
    no respect either for the officers or for the law.”                     Gonzalez v.
    City of Anaheim, 
    747 F.3d 789
    , 799 (9th Cir. 2014) (Trott, J.,
    dissenting     in   part    and      concurring   in   part);   see    also    United
    States v. Fernandez, 
    121 F.3d 777
    , 780 (1st Cir. 1997) (“[L]aw
    enforcement officers usually carry weapons[.]”). Indeed, perhaps
    except for military personnel, police officers likely have more
    experience with a firearm than any other profession in America.
    And    retired      police      officers    are     eligible     to    possess
    prohibited firearms under the FSA only when those firearms come
    directly from their employer upon retirement.                      In other words,
    the FSA does not grant open permission to acquire prohibited
    51
    firearms    at    will.         The    officers       will    therefore          have    special
    familiarity       and    training       with    the    specific           weapons       they    are
    permitted to obtain.             It is significant that the FSA exceptions
    for retired police officers contain this clear nexus to their
    professional law enforcement employment and training.
    2.
    Second,      because       they    are    granted        a        “special    degree       of
    trust,”    O’Donnell       v.    Barry,     
    148 F.3d 1126
    ,        1135    (D.C.       Cir.
    1998), police officers are instilled with what might be called
    an   unusual      ethos   of     public     service.           “[Police          forces]       must
    demand a high level of discipline and duty of their members in
    order to function effectively for the good of all members of
    society.”       Vorbeck v. Schnicker, 
    660 F.2d 1260
    , 1263 (8th Cir.
    1981).     Officers swear to uphold the law and serve the public
    from the very start.             Indeed, they most often take such an oath
    on their first day as an officer.                     Once employed, they agree to
    “serve    mankind,”       and     “to     safeguard         lives        and     property;      to
    protect     the     innocent          against       deception;           the     weak    against
    oppression or intimidation, and the peaceful against violence or
    disorder.”        John    Kleinig,       The    Ethics        of    Policing       236     (1996)
    (quoting       International      Association          of    Chiefs        of    Police’s       Law
    Enforcement Code of Ethics); see also Seegmiller v. LaVerkin
    City,    
    528 F.3d 762
    ,     765    (10th       Cir.    2008)        (describing       a    law
    enforcement       code    of      ethics);          Thaeter        v.     Palm     Beach       Cty.
    52
    Sheriff’s      Office,          
    449 F.3d 1342
    ,      1345-46   (11th    Cir.     2006)
    (same).
    The officers’ responsibilities go beyond mere pledges and
    oaths, as the law requires police officers to meet the highest
    standards      of    conduct          in    acting     to    protect   the    public.      For
    example, a police officer “owe[s] a fiduciary duty to the public
    to make governmental decisions in the public’s best interests.”
    United States v. Woodard, 
    459 F.3d 1078
    , 1086 (11th Cir. 2006).
    Likewise, “police have a duty to protect both the lives and the
    property of citizens.”                 United States v. Markland, 
    635 F.2d 174
    ,
    176 (2d Cir. 1980).              The law then grants officers the authority
    to   arrest,    detain,         and        use   force      to   fulfill    these   essential
    responsibilities.
    Given         these       publicly          oriented        responsibilities,        law
    enforcement officers -- retired and active alike -- are “not to
    be   equated    with        a    private         person     engaged    in    routine    public
    employment or other common occupations of the community.”                                Foley
    v. Connelie, 
    435 U.S. 291
    , 298 (1978); see also Peña v. Lindley,
    No. 2:09–CV–01185–KJM–CKD, 
    2015 WL 854684
    , at *17 (E.D. Cal.
    Feb. 26, 2015) (holding that police officers’ charge to protect
    the public differentiated them from the public); Shew, 994 F.
    Supp. 2d at 252 (same); cf. Detroit Police Officers Ass’n v.
    City of Detroit, 
    190 N.W.2d 97
    , 98 (Mich. 1971) (“The police
    force is a semi-military organization subject at all times to
    53
    immediate       mobilization,          which      distinguishes         this     type       of
    employment       from     every      other     in    the    classified         service.”).
    Retired and active police officers are used to acting in the
    public interest in a way that does not apply to the public at
    large.
    3.
    Third, retired police officers face special threats that
    private       citizens       do     not.       Most    obviously,         “retired          law
    enforcement officers often have to defend themselves . . . from
    criminals whom they have arrested.”                        H.R. Rep. 108-560, at 4
    (2004),       reprinted      in    2004    U.S.C.C.A.N.      805,      806;    see,    e.g.,
    Alison Gendar, Ex-Con with Grudge Busted in Bashing, N.Y. Daily
    News, July 1, 2007, at 13 (“Armed with a grudge and a set of
    brass knuckles, an ex-con pummeled a retired cop last week as
    payback for a minor arrest in 2002, authorities said.”).                                   This
    “greater       risk     of        retaliatory       violence,”         which    continues
    “following retirement,” makes law enforcement officers different
    even from other public employees.                   In re Wheeler, 
    81 A.3d 728
    ,
    763 (N.J. App. Div. 2013); see also Nichols v. Brown, No. CV 11–
    09916 SJO, 
    2013 WL 3368922
    , at *6 (C.D. Cal. July 3, 2013); Mehl
    v. Blanas, No. Civ. S 03-2682 MCE KHM, slip op. at 11 (E.D. Cal.
    Sept.    3,    2004)    (“While      an    officer’s       duty   to    respond       to   the
    public’s calls for help stops when he retires, the threat of
    danger from enemies he might have made during his service does
    54
    not.”); cf. Williams v. Puerto Rico, 
    910 F. Supp. 2d 386
    , 399
    (D.P.R.        2012)   (noting     that           current     and    former     government
    officials       have    a     greater       need       for   firearms    because       “[t]he
    sensitive nature of many of their jobs . . . subjects them to
    additional risks of danger”).
    What’s more, the same public spirit and sense of civic duty
    that motivated retired law enforcement officers when they were
    active might also lead them to intervene more often in dangerous
    situations in retirement.               Just recently, for example, a retired
    police    officer       was    injured       when       he   allegedly    interrupted      a
    robbery at his neighbor’s house.                       See Matthew J. Coyne, Charges
    for 2 in Ex-Cop’s Shooting, J. News (Westchester, N.Y.), July
    15, 2015, at A1.            Other examples are easy to find.                   See, e.g.,
    Kevin     K.     Ivesmillard,      Cops:          Evidence     Doesn’t       Support     Teen
    Burglar’s        Account      of   How       He        Was   Shot,    Daily     Commercial
    (Leesburg, Fla.), Aug. 12, 2015, at A1 (describing a retired
    police officer’s shooting of a burglar who allegedly attacked
    him); Andrew Dys, Suspect Linked to Chester Councilman’s Killing
    Pleads Guilty to Drug Charge, Herald (Rock Hill, S.C.), Mar. 17,
    2015,    at     521    (describing          how    a    retired     police    officer     was
    allegedly shot after he followed gang members en route to a
    robbery).
    *    *     *    *
    55
    Thus, in light of their special training, their extensive
    experience, their commitment to public service, and their unique
    need for protection in the face of post-retirement violence,
    retired law enforcement officers are not similarly situated to
    other Maryland citizens.             That should end the equal-protection
    analysis.      See Brown v. Montoya, 
    662 F.3d 1152
    , 1173 (10th Cir.
    2011) (“[T]o assert a viable equal protection claim, plaintiffs
    must   first    make    a    threshold    showing   that      they   were    treated
    differently from others who were similarly situated to them.”).
    C.
    Chief Judge Traxler, in dissent on this issue, concedes
    that retired police officers are not similarly situated, but
    nonetheless     deems       that   fact   irrelevant     --   positing      that   the
    differences between retired officers and private citizens are
    not sufficiently tied to the FSA’s perceived objectives to be
    decisive.      Plaintiffs never made this sort of argument; they
    argued   instead   that       retired     police   and   private     citizens      are
    equally well-trained and, consequently, similarly situated.                        The
    dissent also focuses on a characteristic that Plaintiffs never
    discuss: the “responsibility or authority . . . to protect” that
    a retired police officer can (or cannot) be said to possess.
    But even if Plaintiffs had pressed such a position, we should
    not embrace it.
    1.
    56
    When passed, the FSA had a number of objectives.                                        Among
    other things, it sought to “keep guns away from criminals” and
    lower    the      rate    of    gun     deaths       from       incidents       like       “murders,
    suicides,      and       accidents,”         all   while         “protect[ing]          legal     gun
    ownership.”           See      J.A.    1183-84.            It    did     so    by     amending    or
    repealing 31 separate sections of the Maryland Code covering
    matters      as    diverse       as    hunting       areas,        mental       health,      police
    training, and state record-keeping requirements.                                     See 2013 Md.
    Laws Ch. 427.             The sheer breadth of the legislation makes it
    obvious      that     the       legislation          was        meant     to     balance      many,
    sometimes-competing objectives.
    The     provisions         permitting          retired           officers       to     obtain
    restricted firearms and magazines are directly related to these
    broad    objectives.             Police       officers’          experience          and    training
    makes   it     less      likely       that    retired       officers          will    harm    others
    through the unskilled use of their firearms.                                  See Shew, 994 F.
    Supp. 2d at 252; Pineiro, 937 F. Supp. 2d at 176.                                     Given their
    years in public service, retired police officers would also be
    more    likely      use     their      firearms       in    ways        consistent         with   the
    public’s interests, not simply private ones.                                    Retired police
    officers would further be expected to exercise special care to
    ensure that their firearms and magazines are not acquired for
    criminal purposes.             And permitting retired police officers these
    particular        firearms        and        magazines          could     deter       the    unique
    57
    retaliatory      violence     that      only     those      officers    face.        Thus,
    retired      police    officers      have      “distinguishing         characteristics
    relevant to the interests” that Maryland intended to serve in
    enacting the FSA.            City of Cleburne, Tex. v. Cleburn Living
    Ctr., 
    473 U.S. 432
    , 441 (1985).
    2.
    In finding to the contrary, the dissent defines the FSA’s
    legislative      objectives       too    narrowly.            It   assumes     that      the
    General   Assembly       intended       the      Act   to    eliminate     all      of   the
    restricted weapons, such that most any exception to a wholesale
    ban would be inconsistent with that objective (regardless of the
    characteristics of those who stand to benefit).                        But the General
    Assembly’s intent seems more nuanced than that: to limit the
    prevalence      of    purportedly       dangerous           firearms    and    magazines
    except in those instances where (1) certain facts ameliorated
    the   expected       harms   from    the      restricted      items,     or   (2)     other
    public interests justified the continuing risk.
    This     approach      is     entirely       acceptable      under      the     Equal
    Protection Clause.           “[T]here is no mandate that a state must
    address its problems wholesale.”                  Helton v. Hunt, 
    330 F.3d 242
    ,
    246 (4th Cir. 2003); accord FCC v. Beach Commc’ns, Inc., 
    508 U.S. 307
    , 316 (1993) (“[T]he legislature must be allowed leeway
    to approach a perceived problem incrementally.”).                        “[S]tates are
    free to regulate by degree, one step at a time, addressing the
    58
    phase of the problem which seems most acute to the legislative
    mind.”       Helton,      
    330 F.3d at 246
    ;       accord       Williamson       v.   Lee
    Optical of Okla. Inc., 
    348 U.S. 483
    , 489 (1955) (“Evils in the
    same    field    may     be     of    different          dimensions         and      proportions,
    requiring       different       remedies.               Or     so     the       legislature      may
    think.”).       The FSA is more appropriately characterized as such a
    step-by-step attempt.
    The   dissent      also       casts    its       lot    with       the    Ninth   Circuit,
    resting much of its analysis on an abrogated decision from that
    court,    Silveira       v.   Lockyer,            
    312 F.3d 1052
        (9th     Cir.    2002),
    abrogated       by    District        of    Columbia          v.    Heller,       
    554 U.S. 570
    (2008).      But Silveira never engaged with the question before us,
    namely, whether retired police officers are “similarly situated”
    to private citizens.                 Instead, the Ninth Circuit ignored that
    threshold issue and jumped straight to rational-basis review of
    a California statute that granted retired police the right to
    carry semi-automatic weapons despite a ban.                                 See Silveira, 312
    F.3d    at   1090-91.           The        Ninth       Circuit       then       established      the
    California       statute’s           objectives          by    relying          on    legislative
    history and public statements specific to that statute, all of
    which     indicated       that        the    California             law     was      intended     to
    “eliminate       the      availability             of        the     [restricted]           weapons
    generally.”          Id. at 1091.          In contrast, the record here contains
    59
    no evidence that the Maryland General Assembly had any similarly
    prohibitionist intent.
    Most fundamentally, Silveira appears to have been animated
    by a hostility toward so-called “assault weapons” in general.
    Id. (holding that there is no “legitimate state interest” in
    permitting retired police officers -- and apparently anyone --
    to    “possess      and     use”       “military-style      weapons”      “for    their
    personal pleasure”); cf. Nordyke v. King, 
    319 F.3d 1185
    , 1192
    n.4    (9th     Cir.      2003)        (criticizing     “the      Silveira       panel’s
    unnecessary historical disquisition” in which it “took it upon
    itself” to advance a limited reading of the Second Amendment).
    Silveira’s equal-protection analysis should be put aside as a
    legally     unsound    and      factually     distinguishable      discussion      that
    lacks any persuasive authority.
    D.
    For     all   these       reasons,     we   affirm    the   district       court’s
    decision on the equal-protection issue.                    Retired police officers
    and   the     public      are    not    similarly     situated,     and    dissimilar
    treatment of these dissimilar groups does not violate the Equal
    Protection Clause.
    TRAXLER, Chief Judge, wrote the opinion for the court as to
    Parts V and VI, in which Judge Agee joined:
    V.   Vagueness
    60
    Finally,      Plaintiffs          contend          that        the       FSA     is
    unconstitutionally vague on its face because it is not drafted
    with    sufficient      clarity     to     allow     an        ordinary     citizen    to
    understand when a firearm qualifies as a “copy” of a banned
    semi-automatic       rifle.        As     previously           explained,       the    FSA
    prohibits possession of “assault long guns,” which are defined
    by reference to the list of specific “assault weapons or their
    copies” set forth in § 5-101(r)(2).                 The statute does not define
    the term “copies,” and there is no state regulatory definition.
    The FSA has not been enforced against Plaintiffs, and they do
    not claim that they were forced to forego their Second Amendment
    rights because they were uncertain whether weapons they wished
    to acquire were prohibited.              Nonetheless, Plaintiffs ask us to
    invalidate this portion of the FSA under the Due Process Clause.
    “Due   process    requires        that   a    criminal         statute    provide
    adequate notice to a person of ordinary intelligence that his
    contemplated      conduct     is   illegal,     for       no    man    shall    be    held
    criminally responsible for conduct which he could not reasonably
    understand to be proscribed.”               United States v. Sun, 
    278 F.3d 302
    , 309 (4th Cir. 2002) (internal quotation marks omitted).
    “[T]he void-for-vagueness doctrine requires that a penal statute
    define the criminal offense with sufficient definiteness that
    ordinary people can understand what conduct is prohibited and in
    a manner that does not encourage arbitrary and discriminatory
    61
    enforcement.”      Kolender v. Lawson, 
    461 U.S. 352
    , 357 (1983); see
    United States v. McLamb, 
    985 F.2d 1284
    , 1291 (4th Cir. 1993).
    Our task is to determine “whether the government’s policy is set
    out in terms that the ordinary person exercising ordinary common
    sense can sufficiently understand and comply with.”                          Imaginary
    Images,     Inc.   v.   Evans,    
    612 F.3d 736
    ,   749   (4th    Cir.    2010)
    (internal quotation marks omitted).                  In order to succeed on a
    vagueness challenge, therefore, a litigant must “prove that the
    enactment is vague not in the sense that it requires a person to
    conform his conduct to an imprecise but comprehensible normative
    standard, but rather in the sense that no standard of conduct is
    specified    at    all.”   Village       of    Hoffman     Estates      v.   Flipside,
    Hoffman Estates, Inc., 
    455 U.S. 489
    , 495 n.7 (1982). Put another
    way,   he   must    demonstrate    that       the    “provision    simply       has   no
    core.” 
    Id.
     (internal quotation marks omitted).
    The State urges us to apply the rule set forth in United
    States v. Salerno, requiring Plaintiffs to establish that “no
    set of circumstances exists under which the Act would be valid.”
    
    481 U.S. 739
    , 745 (1987).               We have noted previously that the
    continuing validity of the “no set of circumstances” formulation
    is unclear, see United States v. Comstock, 
    627 F.3d 513
    , 518
    (4th Cir. 2010), and our concern was validated further in the
    Supreme Court’s recent decision in Johnson v. United States, 
    135 S. Ct. 2551
    , 2561 (2015) (“[O]ur holdings squarely contradict
    62
    the   theory       that      a    vague     provision            is    constitutional       merely
    because     there       is   some    conduct          that       clearly     falls    within      the
    provision’s grasp.”).               Regardless, “at the very least, a facial
    challenge cannot succeed if a statute has a ‘plainly legitimate
    sweep.’”         Comstock, 627 F.3d at 518 (quoting Crawford v. Marion
    Cnty. Election Bd., 
    553 U.S. 181
    , 202 (2008); Martin v. Lloyd,
    
    700 F.3d 132
    , 135 (4th Cir. 2012) (“[A] facial challenge is
    ineffective        if    the      statute       has    a     plainly        legitimate     sweep.”
    (internal quotation marks omitted)).
    The phrase “assault weapons and their copies” has a plainly
    legitimate sweep and is not unconstitutionally vague.                                    Although
    the Act does not specifically define “copy,” the plain meaning
    of    the    word—“something             that    is     or       looks      exactly   or    almost
    exactly     like    something         else:      a     version         of   something      that   is
    identical or almost identical to the original”—is not beyond the
    grasp       of    an      ordinary         citizen.                   Merriam-Webster       online
    dictionary.         The word is a familiar one in Maryland state law,
    Md. Code Pub. Safety § 5-101(r)(2), and even federal law, 
    18 U.S.C. § 921
    (a)(30)(A)(i) (1994 & Supp. V 1999).                                       When read
    together with the specific list of prohibited firearms, “copies”
    is sufficiently definite to give notice to an ordinary person of
    the    conduct      that         would    subject          him    to     criminal     sanctions—
    possession of any firearm that is identical or almost identical
    to any of the 60-plus semi-automatic rifles listed in the Act is
    63
    prohibited.       Cf. United States v. Fontaine, 
    697 F.3d 221
    , 226-27
    (3d Cir. 2012) (finding that statute prohibiting possession of
    an     imitation     firearm       during         crime     of     violence        was    not
    unconstitutionally vague).
    Additionally, in 2010, Maryland’s Attorney General provided
    guidance on the meaning of “copy” under section 5-101(r)(2) of
    the Public Safety Code: “[A] copy of a designated assault weapon
    must be similar in its internal components and function to the
    designated weapon.         Cosmetic similarity to an enumerated assault
    weapon    alone    would   not       bring    a    weapon    within      the       regulated
    firearms law.”       95 Op. Att’y Gen. 101. J.A. 678.                    Following the
    Attorney General’s issuance of this opinion, the Maryland State
    Police issued a bulletin indicating that a firearm was subject
    to regulation under the Act if it was “cosmetically similar to a
    specifically       enumerated      assault        weapon”        and   “has    completely
    interchangeable       internal        components          necessary     for        the   full
    operation and function of any one of the specifically enumerated
    assault weapons.”      J.A. 676.
    Plaintiffs argue that the typical gun owner would have no
    way of knowing whether the internal components of one firearm
    are    interchangeable      with      the    internal       components        of    another.
    This argument has a commonsense appeal; nonetheless, Plaintiffs
    have    not   identified       any    firearm       that     they      would       not   risk
    possessing     because     of    any    uncertainty          over      the     meaning     of
    64
    “copies.”       Although it is possible to invent “scenarios in which
    a   regulation        might    be     subject    to     a     successful      vagueness
    challenge,”          Wag More Dogs, LLC v. Cozart, 
    680 F.3d 359
    , 371
    (4th     Cir.    2012),      “speculation       about       possible    vagueness         in
    hypothetical situations not before the Court will not support a
    facial attack on a statute when it is surely valid in the vast
    majority of its intended applications,” 
    id.
     (internal quotation
    marks omitted).         It is telling that the weapons that Plaintiffs,
    according       to   their    own    testimony,       wish    to    acquire    are       all
    clearly prohibited by the FSA.                Section 5-101(r)(2) is therefore
    “surely     valid       in     the     vast      majority       of     its     intended
    applications.”
    Finally, we note that this same list of “assault weapons or
    their copies” has been on the books in Maryland for more than 20
    years.      Although      possession     of     these   weapons      was     not   banned
    prior to passage of the FSA, an individual could not acquire any
    of the specifically listed “assault weapons” or their “copies”
    without submitting to a background check.                    The failure to comply
    with the regulations was subject to criminal sanctions.                                 Yet,
    Plaintiffs       have   not    identified,       and    we    are    unaware       of   any
    instance,       where   the    term    “copy”     created      uncertainty         or    was
    challenged as too vague.
    We reject Plaintiffs’ vagueness argument.                       A statute need
    only have a “legitimate sweep,” Martin, 700 F.3d at 135, that
    65
    identifies a “core” of prohibited conduct, Hoffman Estates, 
    455 U.S. at
    495 n.7.         “A failure by a statute to define all of its
    terms    does   not   necessarily   render     it   impermissibly     vague,”
    Centro Tepeyac v. Montgomery Cnty., 
    722 F.3d 184
    , 191 n.4 (4th
    Cir. 2013), and a “statute need not spell out every possible
    factual scenario with celestial precision to avoid being struck
    down on vagueness grounds,” United States v. Hager, 
    721 F.3d 167
    , 183 (4th Cir. 2013).           In short, “[v]agueness review is
    quite deferential.” United States v. Runyon, 
    707 F.3d 475
    , 502
    (4th     Cir.   2013).      The   challenged    provisions      of   the   Act
    sufficiently demarcate a core of prohibited conduct under the
    Act to survive that deferential test.
    VI.
    To sum up, the panel vacates the district court’s summary
    judgment    order     on   Plaintiffs’    Second    Amendment    claims    and
    remands for the district court to apply strict scrutiny. The
    panel affirms the district court’s summary judgment order on
    Plaintiffs’ Equal Protection claim with respect to the FSA’s
    exception permitting retired law enforcement officers to possess
    semi-automatic rifles. Finally, the panel affirms the district
    court’s conclusion that the FSA is not unconstitutionally vague.
    AFFIRMED IN PART,
    VACATED IN PART,
    AND REMANDED
    66
    KING, Circuit Judge, wrote an opinion dissenting as to Part III
    and concurring in the judgment as to Parts IV and V:
    There is sound reason to conclude that the Second Amendment
    affords    no     protection          whatsoever       to    the    assault   rifles       and
    shotguns,        copycat           weapons,     and     large-capacity         detachable
    magazines that are banned by the State of Maryland.                                Assuming,
    however, that Maryland’s Firearm Safety Act (the “FSA”) burdens
    the Second Amendment right, it is, put most succinctly, subject
    to     nothing     more       than       intermediate        scrutiny.        Indeed,       no
    precedent of the Supreme Court or our own Court compels us to
    rule otherwise.             And the suitability of intermediate scrutiny is
    confirmed by cogent decisions of other courts of appeals.                                    I
    therefore dissent insofar as the panel majority — charting a
    course today that divides us from our sister circuits — vacates
    the district court’s denial of the Plaintiffs’ Second Amendment
    claims and remands for an application of strict scrutiny.
    Although        I     am     dissenting        from    the     panel    majority’s
    reinstatement          of    the    Second     Amendment      claims     pressed     by    the
    Plaintiffs,       I    concur       in   the   judgment      to    the   extent     that    we
    affirm the district court’s denial of the Plaintiffs’ claims
    that    the     FSA     violates         the   Equal    Protection       Clause     of     the
    Fourteenth Amendment and is unconstitutionally vague.                              I would,
    in sum, wholly affirm the judgment of the district court on the
    basis     of     its       summary       judgment      decision,      which    I    commend
    67
    unreservedly.      See Kolbe v. O’Malley, 
    42 F. Supp. 3d 768
     (D. Md.
    2014). 1
    I.
    A.
    Let’s be real:        The assault weapons banned by Maryland’s
    FSA are exceptionally lethal weapons of war.              In fact, the most
    popular     of   the   prohibited    semiautomatic    rifles,      the   AR-15,
    functions almost identically to the military’s fully automatic
    M16.       Significantly, the Supreme Court in its seminal Heller
    decision     singled   out   “M-16   rifles   and   the   like,”   i.e.,   arms
    “that are most useful in military service,” as being “dangerous
    and unusual weapons” not even protected by the Second Amendment.
    See District of Columbia v. Heller, 
    554 U.S. 570
    , 624-25, 627
    (2008) (recognizing “that the Second Amendment does not protect
    those weapons not typically possessed by law-abiding citizens
    1
    In addition to a thoughtful and compelling analysis of the
    Second Amendment claims, the district court provided all the
    reasons needed to reject the equal protection and vagueness
    claims.   See Kolbe, 42 F. Supp. 3d at 797-99 (concluding that
    the FSA does not violate the Equal Protection Clause by
    excepting retired law enforcement officers from the assault-
    weapon and large-capacity-magazine bans, in “that retired law
    enforcement officers are differently situated by virtue of their
    experiences ensuring public safety and their extensive training
    on the use of firearms”); id. at 799-803 (ruling that, because
    it imparts “sufficient notice of banned conduct,” including
    “what constitutes a ‘copy’ of the banned assault long guns,” the
    FSA is not unconstitutionally vague).     As my good colleagues
    recognize, see ante at 46 n.12, the district court also properly
    denied the Plaintiffs’ motion to exclude certain expert and fact
    evidence offered by the State.
    68
    for     lawful     purposes,         such      as      short-barreled     shotguns       [and
    machineguns]”).          Similar to the district court — and unlike the
    panel     majority       —    I     am   far     from     convinced    that     the    Second
    Amendment reaches the AR-15 and other assault weapons prohibited
    under     Maryland           law,    given        their     military-style       features,
    particular       dangerousness,            and    questionable        utility    for   self-
    defense.     See Kolbe, 42 F. Supp. 3d at 788 (“Upon review of all
    the   parties’      evidence,            the   court      seriously    doubts     that   the
    banned    assault        long       guns    are     commonly    possessed       for    lawful
    purposes, particularly self-defense in the home, . . . and is
    inclined    to     find       the    weapons        fall   outside     Second    Amendment
    protection as dangerous and unusual.”).
    That the banned assault weapons are not constitutionally
    protected        finds       considerable         support      in   the   record,       which
    includes the following evidence:
    ●      The AR-15 and other banned assault weapons, like
    their    military   counterparts,    “are    firearms
    designed for the battlefield, for the soldier to
    be able to shoot a large number of rounds across
    a battlefield at a high rate of speed.” See J.A.
    206.      The military-style features of those
    weapons include folding or telescoping stocks,
    pistol     grips,   flash    suppressors,     grenade
    launchers, night sights, and the ability to
    accept detachable magazines and bayonets.       Their
    design results in “a capability for lethality —
    more wounds, more serious, in more victims — far
    beyond    that   of  other  firearms   in    general,
    including other semiautomatic guns.”      See id. at
    1121-22.
    69
    ●   The sole difference between the M16 and the AR-15
    is that the M16 is capable of automatic fire
    while   the   AR-15   is  semiautomatic.     That
    difference is slight, in that automatic firing of
    all the ammunition in a thirty-round magazine
    takes two seconds, whereas a semiautomatic rifle
    can empty the same magazine in about five
    seconds.   Moreover, soldiers and police officers
    are often advised to choose semiautomatic fire,
    because it is more accurate and lethal than
    automatic fire in many combat and law enforcement
    situations.
    ●   The banned assault rifles and shotguns constitute
    no more than 3% of the civilian gun stock, and
    ownership of such weapons is concentrated in less
    than 1% of the U.S. population.       At the same
    time, assault weapons are used disproportionately
    to their ownership in mass shootings and the
    murders of police officers, and they cause more
    fatalities and injuries than other firearms.
    ●   Maryland was inspired to enact the FSA by the
    December 14, 2012 mass shooting at Sandy Hook
    Elementary School in Newtown, Connecticut, where
    the gunman used an AR-15-style assault rifle to
    shoot his way into the locked building and then
    murder twenty first-graders and six educators in
    less than eleven minutes.    That horrific event
    was preceded and has been followed by mass
    shootings across the nation.
    ●   Criminals armed with the banned assault weapons
    possess    a     “military-style    advantage”    in
    firefights with law enforcement, as such weapons
    “allow   criminals    to  effectively   engage   law
    enforcement officers from great distances (far
    beyond distances usually involved in civilian
    self-defense scenarios),” “are more effective
    than handguns against soft body armor,” and
    “offer the capacity to fire dozens of highly-
    lethal    rounds    without    having   to    change
    magazines.” See J.A. 265.
    70
    ●       The banned assault weapons also can be more
    dangerous to civilians than other firearms.   For
    example, “rounds from assault weapons have the
    ability to easily penetrate most materials used
    in standard home construction, car doors, and
    similar materials,” and, when they do so, are
    more effective than rounds fired from handguns.
    See J.A. 279.    Additionally, untrained users of
    assault weapons tend to fire more rounds than
    necessary, increasing the risk to bystanders.
    ●       Although self-defense is a conceivable use of the
    banned assault weapons, most people choose to
    keep   other   firearms   for   self-defense,   and
    assault-weapon   owners   generally   cite  reasons
    other   than   self-defense   for   owning  assault
    weapons. There is no known incident of anyone in
    Maryland using an assault weapon for self-
    defense.
    In these circumstances, I am entirely unable to discern a
    reasonable        basis    for   saying   that,   although   the    M16     is   a
    dangerous and unusual weapon, the AR-15 and similar arms are
    not.       As the panel majority would have it, since all firearms
    are dangerous, the dangerous-and-unusual standard is really only
    concerned with whether a given firearm is unusual, i.e., “not in
    common use or typically possessed by the citizenry.”                  See ante
    at 29-30.         Pursuant to the majority’s view, because M16s have
    long       been   outlawed    while   AR-15s   have   in   some    places    been
    allowed, the AR-15 enjoys Second Amendment protection that the
    M16 is denied.            Accord Friedman v. City of Highland Park, 
    784 F.3d 406
    , 416 (7th Cir. 2015) (Manion, J., dissenting) (“In the
    case of machine guns, nobody has argued, before or since, that
    71
    ordinary citizens used these weapons for lawful purposes, and so
    they have been rightly deemed not to fall within the ambit of
    the Second Amendment.             Had there been even a small amount of
    citizens    who    used   them    for   lawful     purposes,   then    the   Second
    Amendment might have covered them.”).
    There are significant problems with the panel majority’s
    conception of the dangerous-and-unusual standard.                    First of all,
    even    accepting    that    an   “unusual”      weapon   is   one   that    is    not
    commonly        possessed,     “what     line      separates     ‘common’         from
    ‘uncommon’ ownership is something the [Heller] Court did not
    say.”    See Friedman, 784 F.3d at 409 (Easterbrook, J., writing
    for the court).       Moreover,
    relying on how common a weapon is at the time of
    litigation would be circular . . . .     Machine guns
    aren’t commonly owned for lawful purposes today
    because they are illegal; semi-automatic weapons with
    large-capacity magazines are owned more commonly
    because, until recently (in some jurisdictions), they
    have been legal.   Yet it would be absurd to say that
    the reason why a particular weapon can be banned is
    that there is a statute banning it, so that it isn’t
    commonly owned. A law’s existence can’t be the source
    of its own constitutional validity.
    Id.; see also Br. of Appellees 17 (“Focusing . . . solely on the
    number     or     popularity      of    firearms     owned     would    make       the
    constitutionality of a ban dependent on the time at which it was
    enacted, with particularly dangerous weapons suddenly becoming
    entitled to constitutional protection upon reaching an imaginary
    constitutional numerosity threshold, but less dangerous firearms
    72
    permitted    to    be    forever      restricted       if   banned       early       enough.”
    (internal quotation marks omitted)).                   It follows that the term
    “unusual” most likely does not have the meaning accorded to it
    by my colleagues.
    Another     significant        problem     with      the     panel       majority’s
    conception    of    the       dangerous-and-unusual          standard          is    that   it
    renders the word “dangerous” superfluous, on the premise that
    all firearms are dangerous.                In the course of doing so, the
    majority    rejects      the    State’s    contention        that        weapons      lacking
    Second    Amendment       protection       are    “unusually         dangerous”        ones.
    More    specifically,         the   majority      asserts         that    the       unusually
    dangerous benchmark finds no support in Heller and would be too
    difficult to apply.             But the Heller Court surely had relative
    dangerousness       in       mind   when   it    repudiated         Second          Amendment
    protection    for    short-barreled         shotguns        and    “weapons         that    are
    most useful in military service — M-16 rifles and the like.”
    See Heller, 
    554 U.S. at 624-25, 627
     (internal quotation marks
    omitted).    Furthermore, the unusually dangerous benchmark is no
    more    difficult       to    apply   than,      for    example,         the    majority’s
    dubious test of whether a weapon is “not in common use” and thus
    “unusual.”
    That is not to say that it is easy to answer the question
    of whether the assault weapons prohibited by Maryland’s FSA are
    protected by the Second Amendment.                 Nor is it clear whether the
    73
    Second Amendment protects the banned large-capacity detachable
    magazines, or “LCMs.” 2
    The Supreme Court recently declined to expound on those
    issues     when     it     denied   certiorari    in   the   Seventh   Circuit’s
    Friedman case.           See Friedman v. City of Highland Park, 
    136 S. Ct. 447
     (2015).            Other of the federal courts of appeals have
    considered bans similar to Maryland’s, discussed the complexity
    of   the    issue     of     Second   Amendment    coverage,    and    ultimately
    assumed — but not decided — that constitutional protection may
    be afforded to assault weapons and LCMs.               See N.Y. State Rifle &
    Pistol Ass’n, Inc. v. Cuomo, 
    804 F.3d 242
    , 257 (2d Cir. 2015);
    Heller v. District of Columbia, 
    670 F.3d 1244
    , 1261 (D.C. Cir.
    2011) (“Heller II”).            The district court likewise resolved to
    assume without deciding that the FSA “places some burden on the
    2 The State proffers two substantial grounds for ruling that
    LCMs are unprotected. First, LCMs could be deemed dangerous and
    unusual, in view of evidence that, inter alia, they “are
    particularly designed and most suitable for military and law
    enforcement applications.” See J.A. 891; see also, e.g., Kolbe,
    42 F. Supp. 2d at 787-88 (addressing the State’s evidence that
    LCMs “can allow a criminal to cause mass casualties, while
    depriving victims and law enforcement of an opportunity to
    escape or overwhelm an assailant as he reloads his weapon”).
    Second, it could be concluded that LCMs are not “arms” within
    the meaning of the Second Amendment and thus not eligible for
    its protection. See Heller, 
    554 U.S. at 582
     (observing that the
    Second Amendment extends to “bearable arms”); Br. of Appellees
    26 (“A large-capacity detachable magazine is not an ‘arm’
    . . . .     Indeed,   large-capacity  magazines   are  not   even
    ammunition, but instead are devices used for feeding ammunition
    into firearms that can easily be switched out for other devices
    that are of lower capacity . . . .”).
    74
    Second Amendment right.”          See Kolbe, 42 F. Supp. 3d at 789.
    Although I am strongly inclined to instead proclaim that the
    Second    Amendment   is   not   implicated   by    the   FSA,   I   will,   as
    explained below, refrain from doing so.
    B.
    We need not decide today whether the banned assault weapons
    and   large-capacity   detachable     magazines     are   protected    by    the
    Second Amendment, because — following the lead of our colleagues
    on the Second and District of Columbia Circuits — we can assume
    they are so protected and yet rule that Maryland’s FSA passes
    constitutional   muster     under   the   highest   appropriate      level    of
    scrutiny:    that is, the concept of intermediate scrutiny.                  See
    N.Y. State Rifle & Pistol Ass’n, 804 F.3d at 257-64; Heller II,
    
    670 F.3d at 1261-64
    ; see also Kolbe, 42 F. Supp. 3d at 789-97.
    Notably, not a single court of appeals has ever — until now —
    deemed strict scrutiny to be applicable to a firearms regulation
    along the lines of the FSA. 3       Indeed, in the wake of Heller, only
    3In affirming the denial of a preliminary injunction in
    Fyock v. City of Sunnyvale, the Ninth Circuit concluded that the
    district court neither “clearly err[ed] in finding . . . that a
    regulation restricting possession of [LCMs] burdens conduct
    falling within the scope of the Second Amendment,” nor “abused
    its discretion by applying intermediate scrutiny or by finding
    that [the regulation] survived intermediate scrutiny.”   See 
    779 F.3d 991
    , 998 (9th Cir. 2015).     Thereafter, in Friedman, the
    Seventh Circuit upheld the City of Highland Park’s ban on
    assault weapons and LCMs, albeit without applying either
    intermediate or strict scrutiny.        See 784 F.3d at 410
    (Continued)
    75
    the Sixth Circuit has applied strict scrutiny to any firearms
    regulation (there, a prohibition on the possession of firearms
    by a person who has been committed to a mental institution), and
    that decision was vacated by the court’s grant of rehearing en
    banc.    See Tyler v. Hillsdale Cty. Sheriff’s Dep’t, 
    775 F.3d 308
    (6th Cir. 2014), vacated, No. 13-1876 (6th Cir. Apr. 21, 2015),
    ECF No. 50.
    Employing         no     more      than      intermediate       scrutiny    in   our
    constitutional analysis of the FSA is not only counselled by
    decisions     of     other       courts        of   appeals,    it     is   also   entirely
    consistent        with    binding       precedent.        Puzzlingly,        however,   the
    panel majority deems itself “compelled by” the Supreme Court’s
    decisions in Heller and McDonald v. City of Chicago, as well as
    our own post-Heller decisions, to apply strict scrutiny.                                See
    ante    at   7.      Of       course,     as     our   good    Chief    Judge   previously
    explained, “Heller left open the level of scrutiny applicable to
    review a law that burdens conduct protected under the Second
    Amendment,        other       than   to    indicate     that    rational-basis       review
    would not apply in this context.”                      See United States v. Chester,
    (“[I]nstead of trying to decide what level of scrutiny applies,
    and how it works, . . . we think it better to ask whether a
    regulation bans weapons that were common at the time of
    ratification or those that have some reasonable relationship to
    the preservation or efficiency of a well regulated militia, and
    whether law-abiding citizens retain adequate means of self-
    defense.” (internal quotation marks omitted)).
    76
    
    628 F.3d 673
    , 682 (4th Cir. 2010); see also N.Y. State Rifle &
    Pistol Ass’n, 804 F.3d at 253 (“The [Heller] Court did imply
    that [Second Amendment] challenges are subject to one of ‘the
    standards     of   scrutiny    that   we    have    applied       to    enumerated
    constitutional rights,’ though it declined to say which . . . .”
    (quoting Heller, 
    554 U.S. at 628
    )).                McDonald did not amplify
    Heller’s analysis, but instead illuminated only “that the Second
    Amendment right is fully applicable to the States.”                        See 
    561 U.S. 742
    , 750 (2010).         Consequently, neither Heller nor McDonald
    can be read to require or demand strict scrutiny in this case.
    Furthermore,      our     post-Heller     decisions      —        particularly
    United States v. Masciandaro, 
    638 F.3d 458
     (4th Cir. 2011), and
    Woollard v. Gallagher, 
    712 F.3d 865
     (4th Cir. 2013) — do not
    compel   an   application     of   strict    scrutiny   to    each       and   every
    restriction on the right of self-defense in the home.                    According
    to the panel majority, Masciandaro “noted” that “‘any law that
    would burden the “fundamental,” core right of self-defense in
    the home by a law-abiding citizen would be subject to strict
    scrutiny,’” ante at 40 (quoting Masciandaro, 
    638 F.3d at 470
    ),
    while Woollard “observ[ed]” that “restrictions on ‘the right to
    arm oneself at home’ necessitate[] the application of strict
    scrutiny,” 
    id.
     (quoting Woollard, 712 F.3d at 878).                      Actually,
    however, Masciandaro did not note, it merely “assume[d] that any
    law that would burden the ‘fundamental,’ core right of self-
    77
    defense in the home by a law-abiding citizen would be subject to
    strict scrutiny.”        See 
    638 F.3d at 470
     (emphasis added).             And
    Woollard did not observe, it simply described the plaintiffs’
    (rejected) contention that “the right to arm oneself in public
    [is] on equal footing with the right to arm oneself at home,
    necessitating that we apply strict scrutiny in our review of [an
    outside-the-home regulation].”         See 712 F.3d at 878; see also
    id. at 876 (reiterating that Masciandaro did nothing more than
    “‘assume’” that an inside-the-home regulation would be subject
    to   strict   scrutiny    (quoting   Masciandaro,   
    638 F.3d at 470
    )).
    Neither Masciandaro nor Woollard purported to, or had reason to,
    decide whether strict scrutiny always, or even ever, applies to
    regulations burdening the right of self-defense in the home.
    Those decisions do not provide even a smattering of support for
    the majority’s position on the level-of-scrutiny question.
    We are thus left to conduct the analysis spelled out in our
    Chester decision for selecting between strict and intermediate
    scrutiny.      Analogizing    the    Second    Amendment   to     the   First,
    Chester explained that “the level of scrutiny we apply depends
    on the nature of the conduct being regulated and the degree to
    which the challenged law burdens the right.”               See 628 F.3d at
    682.     Here, too, I part ways with the panel majority.             Although
    I assume that the FSA implicates the “core protection” of the
    Second    Amendment   —    “the   right   of   law-abiding,       responsible
    78
    citizens to use arms in defense of hearth and home,” see Heller,
    
    554 U.S. at
       634-35       —    I   simply         cannot        agree      that   the    FSA
    sufficiently burdens that right to elicit strict scrutiny.
    Contrary      to     the       panel   majority,             the    FSA     does   not,   in
    banning      certain      assault         weapons            and    detachable        magazines,
    prohibit “an entire category of weaponry.”                               See ante at 36.        Nor
    “might    [the     FSA]    be    ‘equivalent            to     a   ban     on   a   category     of
    speech.’”        See id. at 37 (quoting Heller II, 
    670 F.3d at 1285
    (Kavanaugh,        J.,    dissenting)).                 To    support       its     theory,     the
    majority carves out the popular AR-15 and its copies as “an
    entire class of semi-automatic rifles.”                              See 
    id.
     at 36 n.11.
    But, of course, a ban on one type of semi-automatic rifle does
    not equate to a prohibition on “an entire category of weaponry”
    in the same sense that, using the Heller example, a blanket ban
    on all handguns does.                That fact — that the FSA does “not ban
    ‘an     entire     class     of       arms’”        —        renders      “the      restrictions
    substantially less burdensome.”                     See N.Y. State Rifle & Pistol
    Ass’n, 804 F.3d at 260 (quoting Heller, 
    554 U.S. at 628
    ).
    Moreover, despite what the panel majority says, it does
    matter that the FSA leaves handguns, as well as nonautomatic and
    some semiautomatic long guns, available for self-defense in the
    home.     According to the majority, Heller “rejected essentially
    the same argument” when it dismissed the contention “‘that it is
    permissible to ban the possession of handguns so long as the
    79
    possession of other firearms (i.e., long guns) is allowed.’”
    See    ante   at    37-38     (quoting      Heller,      
    554 U.S. at 629
    ).     The
    majority’s equation of this case and Heller is wholly untenable,
    because it depends on discounting the relevance of the handgun’s
    status as “the quintessential self-defense weapon” — a status
    that was obviously and unquestionably important to the Supreme
    Court.        See     Heller,      
    554 U.S. at 628-29
          (emphasizing          that
    handguns      are    “overwhelmingly         chosen      by    American         society     for
    [self-defense]”).             To   be     sure,    a    ban    on    the    possession       of
    handguns is far more burdensome on the right of self-defense in
    the home than a prohibition on the possession of AR-15s and
    similar arms.
    At bottom, I agree with the Second and District of Columbia
    Circuits      “that    ‘the     prohibition        of   semi-automatic            rifles    and
    large-capacity magazines does not effectively disarm individuals
    or    substantially      affect      their      ability       to    defend      themselves.’
    The burden imposed by the challenged legislation is real, but it
    is not ‘severe.’”           See N.Y. State Rifle & Pistol Ass’n, 804 F.3d
    at 260 (quoting Heller II, 
    670 F.3d at 1262
    ).                              Accordingly, I
    would apply intermediate scrutiny and, in an analysis like that
    of the district court, uphold Maryland’s FSA as constitutional,
    in that it is reasonably adapted to a substantial government
    interest.        See Kolbe, 42 F. Supp. 3d at 791-97 (concluding,
    inter    alia,      “that    the    ban    on     assault      weapons       is    likely    to
    80
    further the government’s interest in protecting public safety by
    removing weapons that cause greater harm when used — to both
    civilians       and   police    —     and   create      greater      obstacles    for    law
    enforcement in stopping and detaining criminals who are using
    them”).       Simply put, the State has shown all that should be
    required:       a reasonable, if not perfect, fit between the FSA and
    Maryland’s substantial interest in protecting the public safety
    and deterring criminal activity.
    II.
    To their credit, my colleagues declare their rejection of
    the Plaintiffs’ contention that, “once we determine that the
    prohibited       firearms      fall    within     the     protective     ambit     of    the
    Second Amendment, the [FSA] is unconstitutional and our analysis
    is at an end.”          See ante at 32 n.9.               I fear, however, that by
    liberally       extending       constitutional            protection     to      unusually
    dangerous arms and then decreeing strict scrutiny applicable to
    every     ban    on    law-abiding          citizens’       in-home      possession      of
    protected weapons, the panel majority has guaranteed the demise
    of the FSA and other sensible gun-control measures within this
    Circuit.        After all, though strict scrutiny may not be “strict
    in theory, but fatal in fact,” see Adarand Constructors, Inc. v.
    Pena,   
    515 U.S. 200
    ,    237     (1995),      it    is   at    least   “the      most
    demanding test known to constitutional law,” see City of Boerne
    v. Flores, 
    521 U.S. 507
    , 534 (1997).
    81
    This grave matter calls to mind the thoughtful words of our
    esteemed colleague Judge Wilkinson, recognizing in Masciandaro
    the “serious business” of adjudicating the Second Amendment’s
    breadth:      “We do not wish to be even minutely responsible for
    some unspeakably tragic act of mayhem because in the peace of
    our judicial chambers we miscalculated as to Second Amendment
    rights.”      See 
    638 F.3d at 475
    .            To put it mildly, it troubles me
    that, by imprudently and unnecessarily breaking from our sister
    courts   of    appeals    and   ordering        strict   scrutiny       here,     we    are
    impeding Maryland’s and others’ reasonable efforts to prevent
    the next Newtown — or Virginia Tech, or Binghamton, or Fort
    Hood, or Tucson, or Aurora, or Oak Creek, or San Bernardino.                            In
    my view, any burden imposed by the FSA on the Second Amendment
    is far from severe.          On the other hand, the State’s paramount
    interest      in   the   protection      of     its   citizenry    and     the    public
    safety   is    profound     indeed.           Unfortunately,      however,        I    find
    myself outvoted today.
    In these circumstances, and because I strongly agree with
    the   excellent      decision      of    our     distinguished         district       court
    colleague      upholding     the        constitutionality         of     the     FSA,     I
    wholeheartedly dissent.
    82
    TRAXLER, Chief Judge, wrote a dissenting opinion as to Part IV:
    Plaintiffs       contend       that      the         FSA    violates       the   Equal
    Protection    Clause    by       creating       an    exception       for      retired   law
    enforcement officers allowing them to acquire and possess banned
    firearms and LCMs.       Unlike other citizens, retired officers are
    permitted     under     the       Act    to     receive          these      weapons      upon
    retirement.       See    Md.       Code,      Crim.        Law   §§   4-302(7)(i),        4-
    305(a)(2).      Plaintiffs         argue      that        Maryland    arbitrarily        and
    irrationally    grants       a    privilege          to    retired    law      enforcement
    officers that it denies to them and other similarly situated
    citizens.
    The Equal Protection Clause provides that “[n]o State shall
    . . . deny to any person within its jurisdiction the equal
    protection of the laws.”                U.S. Const. amend. XIV, § 1.                      The
    Equal Protection Clause “keeps governmental decisionmakers from
    treating differently persons who are in all relevant respects
    alike.”     Nordlinger v. Hahn, 
    505 U.S. 1
    , 10 (1992).                         The Clause,
    however,     “does     not       take    from        the     States      all     power     of
    classification,” Personnel Adm’r v. Feeney, 
    442 U.S. 256
    , 271
    (1979); “[l]awmaking by its nature requires that legislatures
    classify, and classifications by their nature advantage some and
    disadvantage others.”            Helton v. Hunt, 
    330 F.3d 242
    , 245 (4th
    Cir. 2003).     Since “classification is the very essence of the
    art of legislation,” a challenged classification is “presumed to
    83
    be constitutional under the equal protection clause.”                             Moss v.
    Clark,    
    886 F.2d 686
    ,      689   (4th    Cir.       1989).      To    survive       a
    constitutional challenge under the Equal Protection Clause, the
    classification in question “need only be rationally related to a
    legitimate state interest unless it violates a fundamental right
    or   is    drawn    upon       a    suspect      classification         such    as     race,
    religion, or gender.”               Giarratano v. Johnson, 
    521 F.3d 298
    , 303
    (4th Cir. 2008).
    Plaintiffs      do       not    suggest     that   we    are     presented      with    a
    suspect classification or a classification that impinges upon
    fundamental rights.            Therefore, rational-basis scrutiny applies
    to determine whether the exception for retired law enforcement
    officers     to     possess         prohibited      semi-automatic            rifles    and
    magazines comports with Equal Protection.
    An equal protection plaintiff first must “demonstrate that
    he has been treated differently from others with whom he is
    similarly situated and that the unequal treatment was the result
    of   intentional         or   purposeful       discrimination.”            Morrison         v.
    Garraghty, 
    239 F.3d 648
    , 654 (4th Cir. 2001).                         To be “similarly
    situated”    means       to    be    “similar     in    all    aspects     relevant         to
    attaining the legitimate objectives of legislation.”                              Van Der
    Linde Housing, Inc. v. Rivanna Solid Waste Auth., 
    507 F.3d 290
    ,
    293 (4th Cir. 2007) (emphasis added).                         “Once this showing is
    made, the court proceeds to determine whether the disparity in
    84
    treatment      can     be   justified          under        the    requisite        level      of
    scrutiny.”          Morrison,      
    239 F.3d at 654
    ;    see     e.g.,      City    of
    Cleburne v. Cleburne Living Ctr., Inc., 
    473 U.S. 432
    , 439-40
    (1985).
    In rejecting the equal protection claim, the district court
    proceeded      no    further    than     the        threshold      question       of    whether
    retired    law       enforcement     officers          in    Maryland       are     similarly
    situated to law-abiding citizens who wish to possess weapons
    prohibited      by    the   FSA.         The    district          court     concluded        that
    retired law enforcement officers as a class are not similarly
    situated to the citizenry at large because of their firearms
    training and experience.            The district court noted that officers
    who carry firearms are required to receive continuing classroom
    instruction, complete firearms training and qualify periodically
    with   their     firearms;      that     officers         are     trained    how       to   store
    firearms     and      ammunition     safely          in   the      home;    and     that      law
    enforcement officers, by virtue of their duty and authority to
    protect public safety by use of force if need be, are more
    experienced in the handling of firearms.                            Additionally, those
    officers who use one of the prohibited weapons during the course
    of duty are required to have received specialized training and
    instruction on these weapons.
    Plaintiffs       respond     that       retired          officers     have       varying
    levels of training on these weapons, noting that most officers
    85
    in fact do not have specialized training on a prohibited weapon
    during their employment and the FSA does not require retired
    officers who obtain prohibited weapons under the exception to
    have specialized training.       Plaintiffs suggest that the training
    and experience thus does not differentiate retired officers in
    Maryland from Plaintiffs or other individuals, some of whom are
    trained on the handling of semi-automatic rifles and some of
    whom are not.      Maryland believes the general firearms training
    received by all law enforcement officers while on the job is
    sufficient to set them apart as a class from ordinary citizens.
    Plaintiffs urge us to follow Silveira v. Lockyer, 
    312 F.3d 1052
     (9th Cir. 2002), abrogated on other grounds, District of
    Columbia v. Heller, 
    554 U.S. 570
     (2008), * in which the Ninth
    Circuit   invalidated    a   similar    statutory      provision    under   the
    Equal Protection Clause.         I find this case instructive.              In
    Silveira, the plaintiffs raised an equal protection challenge to
    a California statute banning “assault weapons” but “allowing the
    possession   of   assault    weapons    by   retired    peace   officers    who
    acquire   them    from   their   employers      at     the   time   of   their
    retirement.”      Id. at 1059.    California’s law also contained an
    *  Silveira v. Lockyer reaffirmed the Ninth’s Circuit
    position at the time that the Second Amendment does not confer
    an individual right to bear arms.   See 
    312 F.3d 1052
    , 1060-61
    (9th Cir. 2002).   The Supreme Court, of course, rejected this
    view in District of Columbia v. Heller, 
    554 U.S. 570
    , 592
    (2008).
    86
    exception for active off-duty officers to use assault weapons
    “only   for   law   enforcement        purposes.”      Id.    at   1089    (internal
    quotation     marks   omitted).            The    court   concluded       that    the
    exception for off-duty officers passed muster because it was
    rationally    related      to   the    statutory     objective     of     preserving
    public safety:
    We presume that off-duty officers may find
    themselves   compelled  to   perform  law   enforcement
    functions in various circumstances, and that in
    addition it may be necessary that they have their
    weapons readily available.     Thus, the provision is
    designed to further the very objective of preserving
    the public safety that underlies the [statute].
    Id.     By contrast, the court “discern[ed] no legitimate state
    interest in permitting retired peace officers to possess and use
    [assault weapons] for their personal pleasure” while denying it
    to others.     Id. at 1091 (emphasis added).                 The court explained
    that because the retired officer exception “does not require
    that the transfer [of the weapon to the officer upon retirement]
    be for law enforcement purposes, and the possession and use of
    the weapons is not so limited,” the exception bears no rational
    relationship    and   in    fact      is   “directly   contrary     to    the    act’s
    basic purpose of eliminating the availability of . . . military-
    style weapons and thereby protecting the people of California
    from the scourge of gun violence.”               Id. at 1090.
    The Ninth Circuit did not explicitly address the threshold
    question of whether the plaintiffs and retired law enforcement
    87
    officers were similarly situated; however, the court rejected
    the notion that retired officers should be allowed to possess
    assault weapons for non-law enforcement purposes simply because
    they   “receive      more    extensive      training      regarding      the    use     of
    firearms than do members of the public.”                    Id. at 1091.            As the
    Ninth Circuit explained, “[t]his justification . . . bears no
    reasonable     relationship     to    the       stated   legislative      purpose       of
    banning the possession and use of assault weapons in California
    . . . .      The object of the statute is not to ensure that assault
    weapons are owned by those most skilled in their use; rather, it
    is to eliminate the availability of the weapons generally.”                           Id.
    The district court is likely correct that law enforcement
    officers     receive     greater     firearms        training      and     have       more
    experience in the handling of firearms than an ordinary citizen
    and,    in    that     respect,      are     not     “similarly       situated”         to
    individuals who are not permitted to possess firearms banned
    under the Act.          But, in my view, these differences are not
    “relevant      to      attaining       the        legitimate       objectives           of
    legislation.”          Van    Der    Linde       Housing,    
    507 F.3d at 293
    .
    Maryland’s Act was passed as part of “a comprehensive effort to
    promote public safety and save lives.”                   Brief of Appellees at 9.
    Like the Ninth Circuit in Silveira, I see the general firearms
    training a retired officer received while on active police duty
    as having only attenuated relevance to an overarching objective
    88
    of the FSA—to preserve the safety of the public.                                    A retired
    officer    has      no    greater       responsibility        or    authority        than    an
    ordinary    citizen        to    protect     the    general        public.          I    cannot
    discern    how      a     retired       officer’s    ability        to     wield     a    semi-
    automatic weapon with great adeptness for his personal use would
    promote public safety through the elimination of semi-automatic
    rifles like the AR-15.                  See Silveira, 312 F.3d at 1091 (“The
    object of the statute is not to ensure that assault weapons are
    owned by those most skilled in their use; rather, it is to
    eliminate the availability of the weapons generally.”).                                     For
    purposes of this particular provision, I conclude that retired
    law    enforcement         officers       who     are    no    longer         charged      with
    protecting the public are similarly situated to Plaintiffs who
    also wish to possess the prohibited weapons for personal uses
    such as self-defense.
    Therefore,         the     only    remaining       question        is   “whether      the
    disparity      in     treatment     can     be    justified        under      the   requisite
    level of scrutiny.”              Morrison, 
    239 F.3d at 654
    .                   In this case,
    the requisite level of scrutiny is rational basis review.                                 This
    is    hardly     an      imposing       barrier    for    a   statute         to    surmount.
    Nonetheless, I think the best course, especially in light of our
    decision       to       remand    the      Second       Amendment        claim      for     the
    application of strict scrutiny review, is to remand the equal
    protection claim as well for reconsideration in light of this
    89
    opinion.     The   parties   on   appeal   focused   their   arguments   on
    whether    citizens   like   Plaintiffs    and   retired   law   enforcement
    officers are “similarly situated.”          I would remand and havethe
    parties    focus on whether the FSA’s exception permitting retired
    law enforcement personnel to possess semi-automatic rifles and
    LCMs can be justified.
    90