; (D) the transfer to or purchase by a rail police officer employed by a rail carrier and certified or commissioned as a police officer under the laws of a State of a firearm for law enforcement purposes (whether on or off duty); or (E) the transfer or purchase of a firearm listed as a curio or relic by the Attorney General pursuant to section 921(a)(13). . (b) Penalties Section 924(a)(2) of title 18, United States Code, as amended by this Act, is amended by striking or (cc) and inserting (cc), or (dd) . (c) Conforming amendments Chapter 44 of title 18, United States Code, is amended— (1) in section 922(s), as so redesignated by section 201 of this Act— (A) in paragraph (1)(B)(ii), by striking (g) or (n) and inserting (g), (n), or (dd)(2) ; (B) in paragraph (2), by striking (g) or (n) and inserting (g), (n), or (dd)(2) ; (C) in paragraph (4), by striking (g) or (n) and inserting (g), (n), or (dd)(2) ; and (D) in paragraph (5), by striking (g) or (n) and inserting (g), (n), or (dd)(2) ; and (2) in section 925A, by striking (g) or (n) and inserting (g), (n), or (dd)(2) . (d) Eliminate multiple sales reporting requirement Section 923(g) of title 18, United States Code, is amended by striking paragraph (3). (e) Authority To issue rules and regulations The Attorney General shall prescribe any rules and regulations as are necessary to ensure that the national instant criminal background check system is able to identify whether receipt of a firearm by a prospective transferee would violate section 922(dd) of title 18, United States Code, as added by this Act. 602. Increased penalties for making knowingly false statements in connection with firearms Section 924(a)(3) of title 18, United States Code, is amended in the matter following subparagraph (B) by striking one year and inserting 5 years . 603. Retention of records Section 922(s)(2) of title 18, United States Code, as so redesignated by section 201 of this Act, is amended— (1) in subparagraph (B), by striking ; and and inserting a period