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C  o   g r s  i o a    R e  e a  c   S e r v i c e


                                                                                                 February 12, 2021

Handguns, Stabilizing Braces, and Related Components


On December   18, 2020, the Bureau of Alcohol, Tobacco,
Firearms and Explosives (ATF) published guidance in the
Federal Register for public comment that indicated that it
was preparing to reclassify certain heavier, larger
handguns  (pistols) equipped with stabilizing braces as
more stringently regulated short-barreled rifles. Such a
reclassification would have retroactively triggered the more
extensive paperwork and background check requirements of
the 1934 National Firearms Act (NFA), and required
registration of the owner and firearm with ATF. On
December  23, 2020, however, ATF withdrew its guidance,
pending further Department of Justice review.

Stabilizing Brace: Shooter's Assist or
Shoulder Stock?
Stabilizing braces are devices that can be attached to the
rearward portion (breech) of a handgun or other pistol grip
firearm's frame or receiver. The brace extends backwards,
generally in alignment with the axis of the barrel(s), so the
firearm can be secured to the shooter's forearm, while it is
held by its pistol grip or other short stock, making a
heavier, larger short-stocked firearm easier to handle. The
first prototype stabilizing brace was designed to assist a
veteran and service-connected amputee with firing an AR-
type handgun singlehandedly.

Stabilizing braces and similar devices, however, could
serve more generally as a quasi-shoulder stock. The
addition of shoulder stock to a short-stocked firearm could
possibly change a firearm's classification under current law
due to definitional differences between the NFA and Gun
Control Act of 1968 (GCA).

ATF  has long ruled that the attachment of a shoulder stock
to a handgun or pistol grip firearm transformed that GCA-
regulated firearm into an NFA-regulated short-barreled rifle
or shotgun. In November 2012, however, ATF determined
that attaching a stabilizing brace to an AR-type pistol would
not change that firearm's classification from a solely GCA-
regulated handgun to an NFA-regulated short-barreled rifle.
Since then, many variations of stabilizing braces have been
manufactured and sold in the United States.

In 2015, in an Open Letter, ATF raised questions as to the
legality of using or intending to use stabilizing braces as
shoulder stocks. In several private letters, made public by
the addressees, ATF appeared to walk back these
considerations. In 2018, however, ATF charged an
individual with unlawfully possessing an unregistered
short-barreled rifle-an AR-type pistol equipped with a
cheek rest, which is arguably a variant of a stabilizing
brace. ATF submitted that this cheek rest, when fully
extended, constituted a shoulder stock, because its length
of pull was greater than 13.5 inches (i.e., the distance from


the trigger pad to the end of the cheek rest fully extended).
The defendant was found not guilty by a jury, based partly
on ATF's failure to take the measurement properly in
alignment with the barrel's axis. This case is an example of
how  the absence of definitive determinations about the
legality of firearms equipped with stabilizing braces and
similar devices may create repercussions.

GCA- and NFA-Regulated Firearms
When  Congress passed the GCA, it significantly amended
and repassed the NFA as Title II of that measure. These acts
include different, but respective definitions for the term
firearm (18 U.S.C. §921(a)(3) and 26 U.S.C. §5845(a)).
Under these definitions, all firearms regulated under the
NFA  are first regulated under the GCA. As discussed
below, the three basic types of firearms regulated under the
GCA   are shotguns, rifles, and handguns.

SBSs,  SBRs, AOWs, and DDs
The NFA  further regulates short-barreled shotguns, or
SBSs, and short-barreled rifles, or SBRs: (1) shotguns with
barrels less than 18 inches in length, (2) rifles with barrels
less than 16 inches in length, or (3) any existing shotgun or
rifle that has been modified to be less than 26 inches in
overall length by shortening its stock and/or barrel(s). (See
18 U.S.C. §§921(a)(6) and (8), and 26 U.S.C. §5845(a).)

Under any other weapon, or AOW,  the NFA regulates
smoothbore handguns  (less than 26 inches in overall length)
and other concealable firearms with combination
smoothbore  and rifled bore barrels between 12 and 18
inches in length. The AOW classification also captures
certain deceptive or disguised firearms (e.g., umbrella, belt
buckle, and pen guns). The term any other weapon is
defined at 26 U.S.C. §5845(e).

Under destructive device, or DD, the NFA regulates
non-sporting shotguns; firearms with barrel bore
diameters greater than one-half inch (e.g., grenade
launchers, bazookas, and mortars); as well as grenades,
rockets, mortar rounds, mines, and other explosive devices
(e.g., Molotov cocktails). Congress included similar
definitions for the term destructive device in the GCA
and NFA  (18 U.S.C. §921(a)(4) and 26 U.S.C. §5845(f)). In
addition, the NFA regulates machine guns and firearms
silencers, which are beyond the scope of this In Focus.

Shotgun   and Rifle Definitions
Congress included identical statutory standalone definitions
for the terms shotgun and rifle under the GCA and
NFA.  The term shotgun means a weapon designed or
redesigned, made or remade, and intended to be fired from
the shoulder and designed or redesigned and made or
remade to use the energy of an explosive to fire through a


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