; or (B) is marketed or sold to the public to become or be used as the frame or receiver of a functional firearm once completed, assembled, or converted. . 3. Requirement to preserve instant criminal background check records for 180 days (a) In general Section 922(t)(2)(C) of title 18, United States Code, is amended by inserting after the 180-day period that begins with the date the system complies with subparagraphs (A) and (B), before destroy . (b) Conforming amendment Section 511 of division B of the Consolidated and Further Continuing Appropriations Act, 2012 ( 34 U.S.C. 40901 note; Public Law 112–55 ; 125 Stat. 632) is amended— (1) by striking for— and all that follows through (1) ; and (2) by striking the semicolon and all that follows and inserting a period. (c) Regulations Within 180 days after the date of the enactment of this Act, the Attorney General shall prescribe regulations to implement the amendments made by this section. 4. Requirement that licensed firearms dealers conduct physical check of their firearms business inventory (a) In general Section 923(g) of title 18, United States Code, is amended by adding at the end the following: (8) Each licensee shall conduct a physical check of the firearms inventory of the business of the licensee licensed under this chapter, in accordance with regulations which shall be prescribed by the Attorney General. . (b) Conforming amendment The matter under the heading Bureau of Alcohol, Tobacco, Firearms and Explosives — Salaries and Expenses in title II of division B of the Consolidated and Further Continuing Appropriations Act, 2013 ( 18 U.S.C. 923 note; Public Law 113–6