PARTS Act of 2025

This bill amends the legal definition of "firearm silencer" and "firearm muffler" under federal law. It clarifies that these terms include any device designed to reduce firearm noise, as well as the outer tube or primary housing component that serves as the main structure for noise-reduction parts. The definition specifically covers devices intended to attach to a firearm (directly or via mounts) and excludes other firearms. This change affects how silencers are legally categorized under federal regulations, not who can own them. It does not create new restrictions but refines the scope of existing definitions.