State Legality MatrixPistol BracesMassachusetts
Statute-cited, not legal advice, last verified 2026-10-20
Restricted
Restricted. Braces are not named, but most braced AR-pattern pistols independently fail the two-feature assault-style firearm test. Effective 2024-10-02.
Controlling law: Mass. Gen. Laws ch. 140, § 121 (St. 2024, c. 135); ch. 140, § 131M
Contested entry
The 2024 firearms law does not use the words brace or stabilizing; the pistol prong is what bites. A semiautomatic pistol that accepts a detachable feeding device is an assault-style firearm with two of: a magazine well outside the pistol grip, a second grip for the non-trigger hand, a threaded barrel, or a barrel shroud. A typical AR pistol carries a threaded barrel and a heat-shielding handguard, so it is covered regardless of what sits on the buffer tube, while a braced pistol without two listed features stays lawful. Any host with a barrel under 16 inches is a firearm under § 121, so a Class A License to Carry is required; short-barreled rifles are permitted on the same terms. Chapter 135 is on the November 3, 2026 ballot as Question 9, a referendum on the existing law, and remains in force.
Federal law
The 2023 ATF stabilizing-brace rule was vacated nationwide and is not enforced, but that does not categorically make every brace-equipped firearm a pistol. Under 26 U.S.C. § 5845, federal classification still turns on whether the specific weapon is designed and intended to be fired from the shoulder. A brace-equipped firearm that meets the short-barreled-rifle definition is an NFA firearm; a configuration that remains a pistol is not. Since October 9, 2026, ATF does not enforce the NFA's Form 1 approval and registration requirements for SBRs, as a matter of enforcement discretion, but an SBR still needs an approved Form 5320.20 before interstate transport, state law still applies, and ATF says enforcement could resume if the policy changes. The federal making tax has been $0 since January 1, 2026 under the One Big Beautiful Bill Act.
Federal baseline verified 2026-10-09. Scope: Pistol stabilizing braces (SB Tactical, Maxim Defense, A3 Industries and similar) and the braced pistols they mount on. Short-barreled rifles and state assault-weapon feature tests are tracked as separate classes.
Common questions
Restricted. Braces are not named, but most braced AR-pattern pistols independently fail the two-feature assault-style firearm test. Effective 2024-10-02. Controlling law: Mass. Gen. Laws ch. 140, § 121 (St. 2024, c. 135); ch. 140, § 131M.
The controlling law is Mass. Gen. Laws ch. 140, § 121 (St. 2024, c. 135); ch. 140, § 131M. Braces are not named, but most braced AR-pattern pistols independently fail the two-feature assault-style firearm test.
Massachusetts's rule took effect 2024-10-02. The 2024 firearms law does not use the words brace or stabilizing; the pistol prong is what bites. A semiautomatic pistol that accepts a detachable feeding device is an assault-style firearm with two of: a magazine well outside the pistol grip, a second grip for the non-trigger hand, a threaded barrel, or a barrel shroud. A typical AR pistol carries a threaded barrel and a heat-shielding handguard, so it is covered regardless of what sits on the buffer tube, while a braced pistol without two listed features stays lawful. Any host with a barrel under 16 inches is a firearm under § 121, so a Class A License to Carry is required; short-barreled rifles are permitted on the same terms. Chapter 135 is on the November 3, 2026 ballot as Question 9, a referendum on the existing law, and remains in force.