Massachusetts Weapons & Self-Defense Laws (2026)

Body armor is legal with restrictions to purchase and wear in Massachusetts for civilians without felony convictions. No significant legislative changes to the controlling statute, G.L.

In Massachusetts, brass knuckles are classified as a dangerous weapon and are illegal to possess, carry, or sell. Under Massachusetts General Laws Chapter 269, Section 10, possession of such weapons is prohibited except for law enforcement or other authorized persons.

Butterfly knives are legal to own and carry in Massachusetts with no specific restrictions beyond general knife laws. A 2024 court ruling overturned the ban on switchblades, but this did not directly impact butterfly knife laws.

Massachusetts requires a License to Carry (LTC) or a Firearm Identification (FID) card to carry a concealed firearm. There is no permitless or constitutional carry allowed under Massachusetts General Laws Chapter 140, Sections 131 and 131J.

Flamethrowers are legal to own and use in Massachusetts with no state-level restrictions. No significant legislative changes regarding flamethrowers in recent years.

Nunchucks are illegal to possess in Massachusetts under state weapons laws.

Open carry is legal in Massachusetts but requires a valid permit or license. There have been no major recent changes to Massachusetts' open carry laws, which have consistently required a license.

In Massachusetts, pepper spray is legal for self-defense but is regulated under M.G.L. c. 140, § 131J. It must be purchased from a licensed firearms dealer or pharmacist, and the container size is limited. Possession by minors is prohibited.

Massachusetts prohibits the possession, sale, and transfer of firearm suppressors under M.G.L. c. 140, § 131. Suppressors are considered illegal firearms accessories and are not allowed even with federal registration.

In Massachusetts, switchblades (automatic knives) are generally prohibited under M.G.L. c. 269, § 10(h), which bans possession of certain dangerous weapons including switchblades. Exceptions exist for law enforcement and certain occupational uses. The law specifically prohibits possession, sale, and transfer of switchblades.

Tasers and stun guns are legal in Massachusetts with restrictions such as permits, background checks, or age requirements. A 2018 court ruling made it legal for civilians to possess stun guns for self-defense, and subsequent legislation established the current regulations.