PARTS Act of 2025

This bill updates the federal definition of a “firearm silencer” or “firearm muffler.” It says these terms cover two things: the full device that is made to reduce the sound of a portable gun and attaches to it, and the outer tube or single main part that holds the sound‑reducing pieces and attaches to the gun. It also clarifies that a mount or adapter by itself is not a silencer or muffler.

Key points

• Who is affected: gun owners, sellers, and makers who handle silencers or their main parts.
• What changes: the law clearly includes both the complete device and the main outer tube/part as silencers; mounts/adapters alone don’t count.
• Why it matters: it clarifies what parts are treated like silencers under federal law, which can affect buying, selling, and enforcement.