Conflicting reports abound, but an official ATF letter has made clear that the Sig Brace may not EVER be shouldered without an SOT stamp from the government.
The Firearms and Ammunition Technology Division (FATD), Bureau of Alcohol, Tobacco,
Firearms and Explosives (ATF) has received inquiries from the public concerning the proper use
of devices recently marketed as “stabilizing braces.” These devices are described as “a shooter’s
aid that is designed to improve the single-handed shooting performance of buffer tube equipped
pistols.” The device claims to enhance accuracy and reduce felt recoil when using an AR-style
These items are intended to improve accuracy by using the operator’s forearm to provide stable
support for the AR-type pistol. ATF has previously determined that attaching the brace to a
firearm does not alter the classification of the firearm or subject the firearm to National Firearms
Act (NFA) control. However, this classification is based upon the use of the device as designed.
When the device is redesigned for use as a shoulder stock on a handgun with a rifled barrel under
16 inches in length, the firearm is properly classified as a firearm under the NFA.
The NFA, 26 USCS § 5845, defines “firearm,” in relevant part, as “a shotgun having a barrel or
barrels of less than 18 inches in length” and “a rifle having a barrel or barrels of less than 16
inches in length.” That section defines both “rifle” and “shotgun” as “a weapon designed or
redesigned, made or remade, and intended to be fired from the shoulder….” (Emphasis added).
Pursuant to the plain language of the statute, ATF and its predecessor agency have long held that
a pistol with a barrel less than 16 inches in length and an attached shoulder stock is a NFA
“firearm.” For example, in Revenue Ruling 61-45, Luger and Mauser pistols “having a barrel of
less than 16 inches in length with an attachable shoulder stock affixed” were each classified as a
“short barrel rifle…within the purview of the National Firearms Act.”
In classifying the originally submitted design, ATF considered the objective design of the item as
well as the stated purpose of the item. In submitting this device for classification, the designer
The intent of the buffer tube forearm brace is to facilitate one handed firing of the
AR15 pistol for those with limited strength or mobility due to a handicap. It also
performs the function of sufficiently padding the buffer tube in order to reduce
bruising to the forearm while firing with one hand. Sliding and securing the brace
onto ones forearm and latching the Velcro straps, distributes the weight of the
weapon evenly and assures a snug fit. Therefore, it is no longer necessary to
dangerously “muscle” this large pistol during the one handed aiming process, and
recoil is dispersed significantly, resulting in more accurate shooting without
compromising safety or comfort.
In the classification letter of November 26, 2012, ATF noted that a “shooter would insert his or
her forearm into the device while gripping the pistol’s handgrip-then tighten the Velcro straps for
additional support and retention. Thus configured, the device provides the shooter with
additional support of a firearm while it is still held and operated with one hand.” When strapped
to the wrist and used as designed, it is clear the device does not allow the firearm to be fired from
the shoulder. Therefore, ATF concluded that, pursuant to the information provided, “the device -2-
is not designed or intended to fire a weapon from the shoulder.” In making the classification
ATF determined that the objective design characteristics of the stabilizing brace supported the
ATF hereby confirms that if used as designed—to assist shooters in stabilizing a handgun while
shooting with a single hand—the device is not considered a shoulder stock and therefore may be
attached to a handgun without making a NFA firearm. However, ATF has received numerous
inquiries regarding alternate uses for this device, including use as a shoulder stock. Because the
NFA defines both rifle and shotgun to include any “weapon designed or redesigned, made or
remade, and intended to be fired from the shoulder,” any person who redesigns a stabilizing
brace for use as a shoulder stock makes a NFA firearm when attached to a pistol with a rifled
barrel under 16 inches in length or a handgun with a smooth bore under 18 inches in length.
The GCA does not define the term “redesign” and therefore ATF applies the common meaning.
“Redesign” is defined as “to alter the appearance or function of.” See e.g. Webster’s II New
College Dictionary, Third Ed. (2005). This is not a novel interpretation. For example ATF has
previously advised that an individual possesses a destructive device when possessing antipersonnel
ammunition with an otherwise unregulated 37/38mm flare launcher. See ATF Ruling
95-3. Further, ATF has advised that even use of an unregulated flare and flare launcher as a
weapon results in the making of a NFA weapon. Similarly, ATF has advised that, although
otherwise unregulated, the use of certain nail guns as weapons may result in classification as an
“any other weapon.”
The pistol stabilizing brace was neither “designed” nor approved to be used as a shoulder stock,
and therefore use as a shoulder stock constitutes a “redesign” of the device because a possessor
has changed the very function of the item. Any individual letters stating otherwise are contrary
to the plain language of the NFA, misapply Federal law, and are hereby revoked.
Any person who intends to use a handgun stabilizing brace as a shoulder stock on a pistol
(having a rifled barrel under 16 inches in length or a smooth bore firearm with a barrel under 18
inches in length) must first file an ATF Form 1 and pay the applicable tax because the resulting
firearm will be subject to all provisions of the NFA.
If you have any questions about the issues addressed in this letter, you may contact the Firearms
and Ammunition Technology Division at [email protected] or by phone at (304) 616-4300.
The BATFE letter makes it clear that any pistol outfitted with a Sig Brace and pulled to the shoulder will henceforth be considered a Short-Barreled-Rifle or SBR which requires a special fee and paperwork form the government.