Firearm silencers and firearm mufflers

Section 921(a)(25) of title 18, United States Code, is amended to read as follows: (25) The terms firearm silencer and firearm muffler mean— (A) any device designed or redesigned, made or remade, and intended— (i) to silence, muffle, or diminish the auditory report of a portable firearm; and (ii) to be attached to a portable firearm, directly or through a mount, adaptor, or other device that is not a firearm silencer or firearm muffler; or (B) the outer tube or other single part of any device that— (i) provides the primary housing or is the primary structure for internal sound-reduction components designed or redesigned, made or remade, and intended to silence, muffle, or diminish the auditory report of a portable firearm; and (ii) attaches to a portable firearm, directly or through a mount, adaptor, or other device that is not a firearm silencer or firearm muffler..