; and (B) after purchase by a consumer, can be completed by the consumer to the point at which such casting or blank functions as a firearm frame or receiver for a semiautomatic assault weapon or machinegun or the frame of a handgun. (2) An assault weapon parts kit. (3) A machinegun parts kit. (b) Enforcement by the Federal Trade Commission A violation of subsection (a) shall be treated as a violation of a rule defining an unfair or deceptive act or practice described under section 18(a)(1)(B) of the Federal Trade Commission Act ( 15 U.S.C. 57a(a)(1)(B) ). The Federal Trade Commission shall enforce this section in the same manner, by the same means, and with the same jurisdiction, powers, and duties as though all applicable terms and provisions of the Federal Trade Commission Act ( 15 U.S.C. 41 et seq.) were incorporated into and made a part of this Act. (c) Rule of construction Nothing contained in this Act shall be construed to limit the authority of the Federal Trade Commission under any other provision of law. 4. Requirement that homemade firearms have serial numbers (a) In general Chapter 44 of title 18, United States Code, is amended by inserting after section 923 the following: 923A. Serial numbers for homemade firearms (a) Request A person who has attained 18 years of age and desires to make a firearm, or obtain a unique serial number or other identifying mark for a firearm, may request a licensed dealer to issue a unique serial number or other identifying mark for the firearm, which request shall describe the firearm involved, and state whether the firearm will be (or is) a handgun. (b) Consideration (1) Treatment of request as transfer proposal A request made of a licensed dealer pursuant to subsection (a) with respect to a firearm shall be treated as a proposed transfer of the firearm from the licensed dealer to the applicant, for purposes of section 922(t) of this title and section 103 of the Brady Handgun Violence Prevention Act, except that the Firearms Transaction Record involved shall indicate