The terms “firearm silencer” and “firearm muffler” mean any device for silencing, muffling, or diminishing the report of a portable firearm, including any combination of parts, designed or redesigned, and intended for use in assembling or fabricating a firearm silencer or firearm muffler, and any part intended only for use in such assembly or fabrication.
Numerous paintball and airgun silencers tested by ATF’s Firearms Technology Branch have been determined to be, by nature of their design and function, firearm silencers. Because silencers are NFA weapons, an individual wishing to manufacture or transfer such a silencer must receive prior approval from ATF and pay the required tax. See also “What are the required transfer procedures for an individual who is not qualified as a manufacturer, importer, or dealer of NFA firearms?” and “How does an individual obtain authorization to make an NFA firearm?” for application details.
If you have any further questions as to the classification of a paintball or airgun silencer, please send a written request to ATF’s Firearms Technology Branch.
[18 U.S.C. 921(a)(24), 26 U.S.C. 5845(a), 27 CFR 479.11]