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National Firearms Act Definitions
For the purposes of the National Firearms Act the term Silencer is defined in 18 U.S.C. § 921(a)(24)
The term “Firearm Silencer” or “Firearm Muffler” means any device for silencing, muffling, or diminishing the report of a portable firearm, including any combination of parts, designed or redesigned, and intended for the use in assembling or fabricating a firearm silencer or firearm muffler, any part intended only for use in such assembly or fabrication.