Is Brass Knuckles Legal in Montana? (2026)
No — Brass Knuckles are illegal in Montana as of 2026.
Quick Answer
Montana prohibits the possession, sale, and manufacture of brass knuckles under Mont. Code Ann. § 45-8-331. They are considered prohibited weapons except for law enforcement or military use.
What the Law Says
Montana law does not prohibit the possession of brass knuckles.
— Montana Code Annotated § 45-8-331
| Category | Details |
|---|---|
| Possession | Illegal to possess except for authorized persons. |
| Sale & Purchase | Illegal to sell or manufacture. |
| Penalties | Misdemeanor punishable by fines and/or imprisonment up to 6 months. |
| Age Restriction | None (possession is prohibited regardless of age). |
| Pending Legislation | None known |
The law that previously banned switchblades (MCA 45-8-331) was repealed, but this did not directly impact the legal status of brass knuckles. Montana has also moved to permitless carry for firearms, but this does not apply to other weapons.
Enforcement Reality
Montana law does not explicitly prohibit the possession of brass knuckles. However, carrying them concealed may be illegal, and any criminal use would be prosecuted as assault with a weapon.
A common mistake is to assume that because there is no explicit ban, they are completely unregulated. The law on concealed weapons is broad and could be interpreted to include brass knuckles.
Local Exceptions
None identified. State law applies uniformly across Montana. Local ordinances may still vary — check with your city or county government for any additional rules.
Real-World Scenarios: Brass Knuckles in Montana
Can You Fly With Brass Knuckles Out of Montana?
Since brass knuckles is illegal in Montana, bringing it to the airport compounds your legal exposure. You're now dealing with both state law and federal jurisdiction. Don't do it.
Can You Cross State Lines With Brass Knuckles From Montana?
This is where people get burned. Montana treats brass knuckles as illegal, but neighboring Idaho treats it as restricted. The law changes at the state line — not gradually, not with a warning sign, instantly. "I bought it legally" is not a defense in the new state. Interstate highways near the Montana/Idaho border are known enforcement corridors. If you're driving with out-of-state plates in a state where brass knuckles is illegal, you're a target.
Bottom Line
Brass Knuckles are illegal in Montana. Possession or use can result in criminal charges. Do not assume enforcement is lax — penalties are real. Consult a licensed attorney if you have specific questions.
Montana vs. the Rest of the US
Across the US, carrying brass knuckles is fully legal in 2 states, restricted in 8, and illegal in 40. Montana falls in the ILLEGAL category.
View the full 50-state map →Body Armor Laws Guide
This topic is closely related to body armor and self-defense laws.
Reviewed by cross-referencing the cited state statute against current legislative databases and regulatory publications.
Sources & Verification
This page was reviewed by Ethan Harper by comparing the legal status against the cited state statute. AllowedHere is an informational resource and does not provide legal advice. Consult a licensed attorney for guidance specific to your situation.
Comprehensive Montana Legal Guides
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