Sig Sauer, Inc. v. Brandon , 826 F.3d 598 ( 2016 )


Menu:
  •           United States Court of Appeals
    For the First Circuit
    No. 15-2230
    SIG SAUER, INC.,
    Plaintiff, Appellant,
    v.
    THOMAS E. BRANDON, Acting Director, United States Bureau of
    Alcohol, Tobacco, Firearms, and Explosives,
    Defendant, Appellee.
    APPEAL FROM THE UNITED STATES DISTRICT COURT
    FOR THE DISTRICT OF NEW HAMPSHIRE
    [Hon. Paul J. Barbadoro, U.S. District Judge]
    Before
    Lynch, Thompson, and Barron,
    Circuit Judges.
    Stephen P. Halbrook, with whom Mark C. Rouvalis and Kenton J.
    Villano were on brief, for Appellant.
    Abby C. Wright, Attorney, Appellate Staff, Civil Division,
    U.S. Department of Justice, with whom Benjamin C. Mizer, Principal
    Deputy Assistant Attorney General, Donald Feith, United States
    Attorney, and Michael S. Raab, Attorney, Appellate Staff, Civil
    Division, U.S. Department of Justice, were on brief, for Appellee.
    June 21, 2016
    BARRON,      Circuit Judge.     Sig Sauer, Inc., is a gun
    manufacturer headquartered in New Hampshire.             In this appeal, Sig
    Sauer challenges the District Court's decision to uphold a ruling
    by the Bureau of Alcohol, Tobacco, Firearms, and Explosives ("ATF")
    that a gun Sig Sauer seeks to market includes a "silencer" under
    the National Firearms Act (the "NFA").           
    26 U.S.C. §§ 5801
     et seq.
    We affirm.
    I.
    The    NFA    subjects    "firearms"   to    various   taxes   and
    regulatory requirements, including that the firearm be registered
    with ATF.     
    Id.
     §§ 5811, 5821, 5822, 5841, 5842.           The NFA defines
    a "firearm" to include certain guns and gun parts, including
    "silencers."       
    18 U.S.C. § 921
    .     And the NFA defines a "silencer,"
    to include not only "any device for silencing, muffling, or
    diminishing the report of a portable firearm," but also, and of
    particular relevance here, "any part intended only for use in"
    "assembling or fabricating a firearm silencer or firearm muffler."
    
    Id.
     § 921(a)(24); 
    26 U.S.C. § 5845
    (a)(7) (emphasis added). Failure
    to comply with the NFA's regulatory requirements can result in
    serious criminal penalties.           
    26 U.S.C. § 5871
    .
    ATF permits -- but does not require -- gun makers to
    seek classification letters from ATF prior to manufacturing a gun.
    See Bureau of Alcohol, Tobacco, Firearms and Explosives, National
    Firearms     Act      Handbook    §      7.2.4   (2009),     available      at:
    - 2 -
    https://www.atf.gov/firearms/docs/atf-national-firearms-act-
    handbook-atf-p-53208/download; see also Innovator Enters., Inc. v.
    Jones, 
    28 F. Supp. 3d 14
    , 18-19, 19 n.2 (D.D.C. 2014).             A
    classification letter sets forth "the agency's official position
    concerning the status of the firearms under Federal firearms laws."
    
    Id.
     § 7.2.4.1.
    In this case, Sig Sauer sought a classification letter
    from ATF regarding a part of a gun that it planned to manufacture.
    Sig Sauer noted that ATF might deem the part at issue to be a
    silencer under the NFA on the ground that it was "intended only
    for use" in assembling or fabricating a silencer.          Sig Sauer
    contended, however, that the part was not intended only for such
    a use as it was also intended for use as a muzzle brake.    A muzzle
    brake is a device that is added to a gun to reduce recoil (the
    backwards force that results from firing the gun) and rise (the
    tendency of the barrel to move upwards when the gun is fired).
    See Vais Arms, Inc. v. Vais, 
    383 F.3d 287
    , 288 n.1 (5th Cir. 2004).
    On the basis of its argument that the part was intended for use as
    a muzzle brake, Sig Sauer argued to ATF that the part did not
    qualify as a silencer under the "intended only for use" prong of
    the NFA's definition of a silencer.
    ATF disagreed and issued a classification letter that
    designated the part to be "intended only for use" in assembling or
    fabricating a silencer.   Sig Sauer then asked ATF to reconsider
    - 3 -
    its classification.    ATF again determined, however, that the part
    was a silencer under the "intended only for use" prong of the NFA's
    definition of a silencer.
    At that point, Sig Sauer challenged ATF's classification
    of the part as a silencer by filing suit in the District of New
    Hampshire under the Administrative Procedure Act (the "APA").        
    5 U.S.C. §§ 701
     et seq.1       The parties then jointly moved to stay the
    proceedings   so      that     ATF   could    reconsider   the   part's
    1 The parties agree that ATF's issuance of a classification
    letter is a "final agency action" that is reviewable under the
    Administrative Procedure Act. 
    5 U.S.C. § 704
    . "In determining
    whether a particular agency action is final, 'the core question is
    whether the agency has completed its decisionmaking process, and
    whether the result of that process is one that will directly affect
    the parties.'" Trafalgar Capital Assocs., Inc. v. Cuomo, 
    159 F.3d 21
    , 35 (1st Cir. 1998) (brackets omitted) (quoting Franklin v.
    Massachusetts, 
    505 U.S. 788
    , 797 (1992)). It appears that there
    are no further steps in ATF's administrative process. See Bureau
    of Alcohol, Tobacco, Firearms and Explosives, National Firearms
    Act     Handbook     §     7.2.4      (2009),     available     at:
    https://www.atf.gov/firearms/docs/atf-national-firearms-act-
    handbook-atf-p-53208/download.    And should ATF's classification
    decision stand, Sig Sauer will have to go through with the NFA's
    stringent requirements in order to sell its firearm -- as the
    classification letter states. See Franklin, 
    505 U.S. at 796-97
    ("To determine when an agency action is final, we have looked to,
    among other things, whether its impact 'is sufficiently direct and
    immediate' and has a 'direct effect on . .            . day-to-day
    business.'" (quoting Abbott Labs. v. Gardner, 
    387 U.S. 136
    , 152
    (1967))). In consequence, we agree with the parties that ATF's
    classification decision is a "final agency action" and thus
    reviewable under the APA. See FTC v. Standard Oil Co., 
    449 U.S. 232
    , 241 (1980) (noting that the APA's finality requirement is
    satisfied when a decision is a "'definitive' statement[] of the
    [agency]'s position . . . and had a 'direct and immediate . . .
    effect on the day-to-day business' of the complaining parties."
    (fourth alteration in original) (quoting Abbott Labs., 
    387 U.S. at 151-52
    )).
    - 4 -
    classification.     ATF agreed to accept "additional documents or
    information" in reconsidering its prior ruling.            ATF also agreed
    that, in the event that it affirmed its prior ruling on remand, it
    would consider "additional information and documentation" if Sig
    Sauer chose to make such a submission before the case returned to
    the District Court.
    On remand, ATF affirmed its decision yet again.               Sig
    Sauer   then   submitted,   among   other    materials,    affidavits   that
    stated that it intended the part at issue to lengthen the gun's
    barrel to 16 inches so that the gun would not be subject to the
    NFA on the basis of its length, as rifles that are shorter than 16
    inches are for that reason alone subject to the NFA.          See 
    26 U.S.C. § 5845
    (a)(3).     Sig Sauer thus contended that because it intended
    the part to make the gun sufficiently long that it would not be
    subject to the NFA on the basis of its length, the part was, for
    this reason, too, not "intended only for use" in assembling or
    fabricating a silencer.        ATF declined, however, to change its
    classification of the part.
    Following   ATF's   decision     on   remand,   the   litigation
    resumed in district court, where the parties cross-moved for
    summary judgment.      After a hearing, the District Court granted
    ATF's motion for summary judgment and denied Sig Sauer's.                Sig
    Sauer, Inc. v. Jones, 133 F. Supp. 3d. 364 (D.N.H. 2015).                Sig
    Sauer then timely filed this appeal.
    - 5 -
    II.
    "In the administrative law context, where we review
    directly the decision of the agency, the APA can serve as an
    overlay to the familiar de novo standard applicable to appeals
    from a district court's grant of a summary judgment."      Baystate
    Alt. Staffing, Inc. v. Herman, 
    163 F.3d 668
    , 674 (1st Cir. 1998).
    Under the APA, we review ATF's decision to determine if it is
    "arbitrary, capricious, an abuse of discretion, or otherwise not
    in accordance with law."   
    5 U.S.C. § 706
    (2)(A); see Baystate Alt.
    Staffing, 
    163 F.3d at 674
    . "A decision is arbitrary and capricious
    'if the agency has relied on factors which Congress has not
    intended it to consider, entirely failed to consider an important
    aspect of the problem, offered an explanation for its decision
    that runs counter to the evidence before the agency, or is so
    implausible that it could not be ascribed to a difference in view
    or the product of agency expertise.'"    Craker v. DEA, 
    714 F.3d 17
    ,
    26 (1st Cir. 2013) (quoting Motor Vehicle Mfrs. Ass'n v. State
    Farm Mut. Auto. Ins. Co., 
    463 U.S. 29
    , 43 (1983)).   And, of course,
    "[w]e may not substitute our judgment for that of the agency, even
    if we disagree with its conclusions."    
    Id.
    III.
    Sig Sauer first contends that ATF classified the part as
    a silencer merely because it was "capable of use" in assembling or
    fabricating a silencer and thus failed to evaluate whether, as the
    - 6 -
    NFA requires, the part was "intended only for use" in assembling
    or fabricating a silencer.           Sig Sauer bases this contention on the
    fact that ATF examined, among other things, the part's design
    features and objective capabilities.
    But ATF persuasively explained in its classification
    letter that it examines a part's design features -- and thus the
    uses of which a part is capable -- as part of the inquiry into
    whether a part is intended to be used only in assembling or
    fabricating a silencer.           Such an objective approach to ferreting
    out a party's intent is a very familiar one in the law.                   See, e.g.,
    United States v. Siciliano, 
    578 F.3d 61
    , 77 (1st Cir. 2009) (noting
    that objective evidence is useful to "buttress or rebut direct
    testimony as to intent"); cf. Washington v. Davis, 
    426 U.S. 229
    ,
    253    (1976)    (Stevens,     J.,     concurring)       ("Frequently     the     most
    probative evidence of intent will be objective evidence of what
    actually happened rather than evidence describing the subjective
    state of mind of the actor."); United States v. Gaw, 
    817 F.3d 1
    (1st   Cir.     2016)   ("[T]he    law   is   long      since   settled    that   the
    prosecution may prove its case without direct evidence of a
    defendant's guilty knowledge so long as the array of circumstantial
    evidence possesses sufficient persuasive power." (quoting United
    States v. O'Brien, 
    14 F.3d 703
    , 706 (1st Cir. 1994))).                    Nor do we
    have   any    reason    to   suppose     it   is   an   approach   that     the   NFA
    prohibits.      In fact, it is hard to believe that Congress intended
    - 7 -
    to invite manufacturers to evade the NFA's carefully constructed
    regulatory regime simply by asserting an intended use for a part
    that objective evidence in the record -- such as a part's design
    features -- indicates is not actually an intended one.            See United
    States v. Syverson, 
    90 F.3d 227
    , 232 (7th Cir. 1996) (holding that
    a device was "intended only for use" in assembling or fabricating
    a silencer notwithstanding the designer's stated intention that it
    be used as a muzzle brake).
    Because we find persuasive ATF's contention that it may
    consider objective evidence in determining whether a part is
    "intended only for use" in assembling or fabricating a silencer,
    see Skidmore v. Swift & Co., 
    323 U.S. 134
    , 140 (1944), ATF
    committed     no   legal   error    of     the   sort   Sig   Sauer    claims.
    Accordingly, we need decide only the sole remaining point of
    dispute between the parties: whether there is a sufficiently
    reasoned    basis    in    the     administrative       record   for    ATF's
    classification of this part as one that is "intended only for use"
    in assembling or fabricating a silencer.            And so we now turn to
    that issue.
    IV.
    ATF concluded that the part at issue is intended for use
    only in assembling or fabricating a silencer because it was
    designed with features that are common to all silencers but no
    muzzle brakes; because the gun that includes the part is not of a
    - 8 -
    type that requires, or is sold with, a muzzle brake; and because
    Sig Sauer initially submitted a prototype of the gun to ATF that
    functioned safely only if the part at issue was encased and thus
    had   been   made   into   a   completed   silencer.   Given   that   the
    administrative record adequately supports these findings, and that
    these findings reasonably support ATF's conclusion that the part
    is "intended only for use" in assembling or fabricating a silencer,
    we conclude that ATF's classification of this part as a silencer
    is not arbitrary and capricious.       See State Farm, 
    463 U.S. at 43
    .
    We start with ATF's well supported findings that the
    part was identical to the interior of a silencer because it was a
    part that is known as "a monolithic baffle core."          In reaching
    this conclusion, ATF pointed to the depictions of other monolithic
    baffle cores that are part of the administrative record               and
    explained that, like these monolithic baffle cores, this part also
    "contains angled baffles and (when assembled with an outer tube)
    walls forming integral expansion chambers."       ATF further explained
    that "expansion chambers . . . reduce sound by capturing and
    slowing propellant gases" and thus enable this part (when encased)
    to do the key thing that a silencer does: "diminish[] the report"
    of a firearm.
    Further supporting ATF's finding that this part is a
    monolithic baffle core is the fact that, through testing, ATF found
    that the part significantly reduced the report of a gunshot when
    - 9 -
    it was encased.   Moreover, ATF supportably found that this part is
    identical to the monolithic baffle core that Sig Sauer uses as the
    interior of the complete silencers that it sells; that Sig Sauer
    used the same part number to identify the part in question here
    and the core of its removable silencer; that Sig Sauer labeled
    this part a "silencer" on its invoice;2 and that the part included
    threading at the muzzle end that made it easy to encase the part
    to produce a complete silencer.
    Sig Sauer points to nothing in the record that undermines
    these findings about the features of this part that make it
    identical to the interior of a silencer.              For while Sig Sauer
    disputes ATF's interpretation of the similarity between this part
    and the depictions of the monolithic baffle cores in the record,
    Sig Sauer has given us no reason not to defer to ATF's contrary
    interpretation of this evidence, which is well "within [ATF's]
    special competence."        Penobscot Air Servs., Ltd. v. FAA, 
    164 F.3d 713
    , 718 (1st Cir. 1999) (quoting Univ. Camera Corp. v. NLRB, 
    340 U.S. 474
    , 490 (1951)).       And our deference to ATF's interpretation
    of   this   evidence   is    especially   warranted    given   that   proper
    evaluation of this evidence "requires a high level of technical
    2Sig Sauer contends that it labelled the part this way only
    in order to comply with ATF's ruling that the part in question is
    a silencer. But ATF was free to conclude otherwise, as there is
    nothing in the record to suggest that ATF's ruling required the
    use of such a label.
    - 10 -
    expertise."         Marsh v. Or. Nat. Res. Council, 
    490 U.S. 360
    , 377
    (1989) (quoting Kleppe v. Sierra Club, 
    427 U.S. 390
    , 412 (1976));
    see also R.I. Higher Educ. Assistance Auth. v. Sec'y, U.S. Dep't
    of Educ., 
    929 F.2d 844
    , 857 (1st Cir. 1991) (collecting cases).3
    To be sure, the record does contain an affidavit from a
    Sig    Sauer      engineer     purporting    to   distinguish       this    part    from
    monolithic baffle cores.             But Sig Sauer has made no effort to
    explain why we should credit that affidavit over ATF's conclusions.
    In fact, although Sig Sauer's counsel at argument stated that the
    finding      that    this    part   is   a   monolithic      baffle    core    is    not
    supported, he agreed with the District Court's characterization
    that       Sig   Sauer   had    "basically     taken   the    cap     off    [of    its]
    silencer, . . . welded it onto the gun, and [was] just going to
    sell it as a muzzle brake."
    In finding that this part is identical to the interior
    of a silencer, ATF did not dispute that the part also reduced the
    gun's recoil and rise, as a muzzle brake also does.                         But as Sig
    Sauer itself emphasizes, the standard under the NFA's silencer
    definition focuses on the relevant part's intended use rather than
    on uses of which the relevant part is merely capable.                          See 
    18 U.S.C. § 921
    (a)(24); see United States v. Crooker, 
    608 F.3d 94
    , 97
    3
    Sig Sauer does argue that the part at issue somewhat
    amplifies the sound of a gunshot when the part is not encased.
    But ATF found that the component was identical to the interior of
    a silencer because of how it functioned when it was encased.
    - 11 -
    (1st Cir. 2010) (per curium).    Thus, while the fact that this part
    incidentally reduces the gun's rise and recoil shows that it is
    capable of doing so, that fact is not necessarily determinative of
    whether Sig Sauer intended this part to be used for that purpose.
    See Crooker, 
    608 F.3d at 97
    ; see also United States v. Carter, 
    465 F.3d 658
    , 667 (6th Cir. 2006) (per curium) ("[Congress's] word
    choice indicates a concern for the purpose of the mechanism, and
    the parts thereof, not the function." (emphasis omitted)).       In
    fact, ATF supportably found that "any additional weight placed at
    the end of a firearm barrel may" incidentally reduce recoil and
    rise even though not everything that adds such weight is thereby
    intended to be used as a muzzle brake.     Cf. Crooker, 
    608 F.3d at 97
     ("If the statute [spoke of] a device 'capable' of being used as
    a silencer . . . there would be problems at least of degree in
    determining what 'capable' meant . . . ; apparently, a potato or
    a soda bottle may, with varying efficacy and varying risk, be used
    to muffle a firearm shot.").    And, in concluding that in this case
    Sig Sauer did not intend the part to be used to reduce recoil and
    rise, ATF relied on several pieces of evidence that it reasonably
    determined pointed against the conclusion that Sig Sauer intended
    the part to be used as a muzzle brake and in favor of the conclusion
    that Sig Sauer intended the part to be used only in assembling or
    fabricating a silencer.
    - 12 -
    As an initial matter, ATF found that the part has design
    features uncharacteristic of muzzle brakes and characteristic only
    of the interior of silencers.        In particular, ATF found that the
    length to width ratio of the part "is much greater than that of
    conventional    muzzle   brakes   and   is   consistent   with   those   of"
    silencers.     ATF also found that while the interior of this part
    was designed with baffles so that the part would create "expansion
    chambers" when encased -- thus making the part useful in assembling
    or fabricating a silencer -- no muzzle brakes have such baffles.4
    In addition, ATF found that the sort of gun for which
    this part was intended -- a pistol caliber semiautomatic gun --
    has little or no practical use for a muzzle brake, because such
    guns do not produce a substantial recoil in the way that larger
    guns and automatic guns do.       And ATF further found that other non-
    automatic guns of this type are not sold with muzzle brakes, a
    fact that ATF reasonably found indicated that any reduction in
    recoil and rise attributable to this part was incidental to its
    use as an integral component of a completed silencer.
    4 In its brief to us, ATF points to articles reviewing the
    gun, which ATF contends support its position that the part was not
    a conventional muzzle brake. These articles called the part "one
    of the coolest things to be unveiled," described it as a "gigantic"
    and "very large" "muzzle brake," and stated that it was a silencer
    core and that Sig Sauer would happily sell one the casing to turn
    the part into a silencer.      In reply, Sig Sauer says that the
    articles recognize that the part was a muzzle brake. As it appears
    ATF did not rely on these articles in making its decision, we do
    not rely on them here.
    - 13 -
    In further support of its classification of the part,
    ATF reasonably found that the design of Sig Sauer's original
    prototype of the gun indicated that the part was not intended for
    use as a muzzle brake.    That prototype included a longer hand
    guard, which partially covered the part in question.    But muzzle
    brakes, ATF explained, are "designed to be positioned at the muzzle
    end of a firearm barrel, and in front of a shooter's hand."      In
    fact, ATF noted that the prototype was designed so as to "redirect
    hot gases onto the shooter's hand each time a projectile was
    fired," thus making it so that the prototype could have been fired
    safely only if the part in question was encased.          ATF thus
    concluded that "[t]he very configuration of SIG's submission . .
    . suggests that the submission is not, in fact, designed as a
    muzzle brake," and was instead designed only as a component of a
    silencer, as the part could have functioned safely on the initial
    prototype only if the part was made into a completed silencer.
    Sig Sauer does nothing to rebut these findings.        In
    offering a conclusory challenge to ATF's interpretation of the
    differences between this part and the depictions of the muzzle
    brakes that are contained in the administrative record, Sig Sauer
    offers no reason as to why we should favor its evaluation of this
    technical evidence over ATF's.   See Marsh, 
    490 U.S. at 377
    ; R.I.
    Higher Educ. Assistance Auth., 
    929 F.2d at 857
     (collecting cases).
    And while Sig Sauer does point out in its brief that muzzle brakes
    - 14 -
    also have slots that allow gases to escape, Sig Sauer does not
    dispute ATF's finding that the slots in this part are designed to
    produce expansion chambers when encased while the slots in muzzle
    brakes are not.    Similarly, while Sig Sauer argues that some
    smaller caliber guns are sold with muzzle brakes, Sig Sauer does
    not dispute ATF's finding that pistol-caliber guns that are not
    capable of automatic fire -- as the gun in question here is
    not -- are not sold with muzzle brakes.
    Sig Sauer does argue that ATF erred in giving weight to
    the fact that Sig Sauer originally submitted a prototype in which
    the part now claimed to be a muzzle brake actually could not safely
    function as one.   And we agree with Sig Sauer that the design of
    the original prototype is not dispositive of the part's intended
    use in its present incarnation.     Nonetheless, the fact that Sig
    Sauer was willing to proceed with a prototype in which the part
    could not be safely used as a muzzle brake at all does provide
    some additional support, in combination with the other findings on
    which ATF relied, for ATF's determination that Sig Sauer intended
    this part to be used only in assembling or fabricating a silencer,
    notwithstanding that the part also incidentally reduces recoil and
    rise.5
    5 Sig Sauer's reliance on Innovator Enterprises is misplaced,
    as that case is easily distinguishable. 28 F. Supp. 3d at 14.
    Innovator Enterprises dealt with the first prong of the silencer
    definition -- a "device for silencing, muffling, or diminishing
    - 15 -
    In sum, ATF reasonably determined on the basis of the
    record that the part's capacity to reduce recoil and rise was
    merely an incidental consequence of the inclusion of the part on
    the gun -- a consequence that ATF supportably found would result
    from adding any additional weight to the gun.                Given that ATF
    supportably found that this type of gun does not need a muzzle
    brake and is not typically sold with a muzzle brake, and given
    that ATF supportably found that this part is identical to the
    interior of a silencer and does not share the design features
    typical of other muzzle brakes, we see no basis for concluding
    that ATF's classification of this part as having been "intended
    only for use" in assembling or fabricating a silencer is arbitrary
    and capricious.
    Sig     Sauer   does   make    one     last   challenge   to   ATF's
    classification of the part.       This challenge pertains not to the
    part's possible use as a muzzle brake, but rather to the fact that
    the part extended the gun's length.              Sig Sauer argues that it
    intended the part to be used to extend the gun's barrel to 16
    inches, so that its length would not make it subject to the NFA.
    the report of a portable firearm" -- rather than the "intended
    only for use" prong that is at issue here. Id. at 18-19. Moreover,
    Innovator Enterprises determined that ATF had failed to examine
    whether the putatively complete silencer actually did diminish the
    report of a firearm, as ATF refused to do any sound testing of the
    part. Id. at 30. Here, by contrast, ATF did perform sound testing
    and determined that, when encased, the part reduced the report of
    a firearm.
    - 16 -
    See 
    26 U.S.C. § 5845
    (a)(3).       Sig Sauer thus contends that, for
    this reason, the part was not intended only for use in assembling
    or fabricating a silencer as it was also intended to be used to
    make the gun sufficiently long that the gun would not be subject
    to the NFA due to its length.
    ATF responds that a "use" must be determined from the
    point of view "of the firearm operator," rather than from the point
    of view of the manufacturer, even though it is the manufacturer's
    "intent" regarding the part's use that matters.      Gov. Br. at 20.
    Otherwise, ATF contends, a manufacturer's claimed interest in
    increasing profitability or aesthetic appeal could count as an
    intended use for a part, thereby making the "intended only for
    use" prong of the silencer definition effectively meaningless.
    Accordingly, ATF argues that it is wrong to treat Sig Sauer's
    intention for the part to extend the gun's length as an intended
    use of that part.
    We need not resolve whether ATF is right on this point
    because the District Court correctly concluded that Sig Sauer did
    not properly raise this argument regarding the part's length in
    its initial submission to ATF.6    Sig Sauer did present this length-
    based argument when it submitted the "additional information and
    6 Sig Sauer's original submission merely noted that the
    firearm, measured with the part in question, was 16 inches long;
    Sig Sauer made no argument at that time that this fact had any
    bearing on whether the part was a silencer under the NFA.
    - 17 -
    documentation" that ATF agreed to accept on remand from the
    District Court.    But while ATF agreed on remand to consider
    "additional information and documentation," the agreement does not
    say that ATF agreed to address brand new arguments made for the
    first time in a new submission.    Thus, we agree with the District
    Court that Sig Sauer waived its argument about the part's length
    because it failed to raise that argument to the ATF prior to the
    District Court's remand to the agency.
    V.
    For the foregoing reasons, the District Court's grant of
    summary judgment is affirmed.
    - 18 -