State Legality MatrixPistol BracesMassachusetts
Statute-cited, last verified 2026-08-04
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 faces a certified veto referendum on the November 3, 2026 ballot but 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 requires NFA approval and registration; a configuration that remains a pistol does not. Building an actual short-barreled rifle is still an NFA act: Form 1, fingerprints, CLEO notification, a NICS check, and registration all apply. The federal making tax has been $0 since January 1, 2026 under the One Big Beautiful Bill Act, and eForm approvals currently run days to a couple of weeks.
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 faces a certified veto referendum on the November 3, 2026 ballot but remains in force.
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 requires NFA approval and registration; a configuration that remains a pistol does not. Building an actual short-barreled rifle is still an NFA act: Form 1, fingerprints, CLEO notification, a NICS check, and registration all apply. The federal making tax has been $0 since January 1, 2026 under the One Big Beautiful Bill Act, and eForm approvals currently run days to a couple of weeks.