; and (II) an object that is marketed or sold to become or be used as the frame or receiver of a functional firearm once completed, assembled, or converted. (B) For purposes of subparagraph (A)(i), if a weapon has more than 1 part that provides the housing or a structure designed to hold or integrate 1 or more fire control or essential components, each such part shall be considered a frame or receiver, unless the Attorney General has provided otherwise by regulation with respect to the specific make and model of weapon on or before January 1, 2024. ; and (3) by adding at the end the following: (38) The term ghost gun — (A) means a firearm, including a frame or receiver, that lacks a unique serial number engraved or cast on the frame or receiver by a licensed manufacturer or importer in accordance with this chapter; and (B) does not include— (i) a firearm that has been rendered permanently inoperable; (ii) a firearm identified by means of a unique serial number assigned by a State agency and engraved or cast on the frame or receiver of the weapon before the effective date of the Ghost Guns and Untraceable Firearms Act of 2023 in accordance with a State law; (iii) a firearm manufactured or imported before December 16, 1968; or (iv) a firearm identified as provided for under section 5842 of the Internal Revenue Code of 1986. (39) The term fire control component — (A) means a component necessary for the firearm to initiate or complete the firing sequence; and (B) includes a hammer, bolt or breechblock, cylinder, trigger mechanism, firing pin, striker, and slide rails. . (b) Prohibition