Searching for “Silencer”
(3) Multi-piece frame or receiver. In the case of a multi-piece frame or receiver, the modular subpart that is the outermost housing or structure designed to house, hold, or contain either the primary energized component of a handgun, breech blocking or sealing component of a projectile weapon other than a handgun, or internal sound reduction component of a firearm muffler or firearm silencer, as the case may be, shall be the subpart of a multi-piece frame or receiver identified in accordance with this section. If more than one subpart is similarly designed to house, hold, or contain such primary component ( e.g., left and right halves), each of those subparts must be identified with the same serial number and associated licensee information not duplicated on any other frame or receiver. The identified subpart(s) of a complete (assembled or unassembled) multi-piece frame or receiver shall not be removed and replaced ( see § 478.34 of this subchapter, 18 U.S.C. 922(k), and 26 U.S.C. 5861(g) and (h)), unless—
Complete muffler or silencer device. A muffler or silencer that contains all component parts necessary to function, whether or not assembled or operable.