Are Suppressors Legal in Montana?

Montana sections 45-8-336 and 45-8-337 address possession of a silencer and treat possession of an unregistered silencer as prima facie evidence of an unlawful purpose. Registration status is therefore an express Montana evidentiary fact, not merely a federal administrative detail.

Suppressors are federally legal to own under the NFA. As of January 1, 2026 the One Big Beautiful Bill Act (signed July 2025) zeroed the federal making and transfer tax on suppressors, formerly $200. Form 4 or Form 1, fingerprints, the NICS background check, and NFA registration are all still required; ATF eForm approvals currently run days to a couple of weeks.

Scope: Firearm suppressors (silencers) as defined by the NFA. Federal NFA compliance (Form 4 or Form 1, fingerprints, NICS, registration) is required everywhere they are legal.