US SB1039

Amends Section 921(a)(25) of title 18, U.S. Code to revise the legal definitions of "firearm silencer" and "firearm muffler"

Defines a firearm silencer/muffler as a complete device designed to silence, muffle, or diminish the auditory report of a portable firearm and intended to attach to the firearm directly or through a mount or adaptor

Alternatively defines a silencer/muffler as the outer tube or single part that provides the primary housing for internal sound-reduction components, rather than treating all individual component parts as silencers

Narrows the scope of what qualifies as a regulated silencer by excluding mounts, adaptors, or other devices that are not themselves silencers or mufflers

Introduced March 13, 2025 by Senator Sheehy with 7 Republican cosponsors and referred to the Senate Judiciary Committee