; and (B) the transferee is not known to be prohibited from possessing or receiving a grandfathered semiautomatic assault weapon. (3) For purposes of this subsection, the term transfer — (A) shall include a sale, gift, or loan; and (B) does not include temporary custody of the grandfathered semiautomatic assault weapon for purposes of examination or evaluation by a prospective transferee. (4) (A) Notwithstanding any other provision of this chapter, the Attorney General may implement this subsection with regulations. (B) Regulations promulgated under this paragraph— (i) shall include a provision setting a maximum fee that may be charged by licensees for services provided in accordance with paragraph (1); and (ii) shall not include any provision imposing recordkeeping requirements on any unlicensed transferor or requiring licensees to facilitate transfers in accordance with paragraph (1). . (b) Penalties Section 924(a)(1)(B) of title 18, United States Code, as amended by section 513 of this Act, is amended by striking or (aa) and inserting (aa), or (bb) . 515. Use of Byrne grants for buy-back programs for semiautomatic assault weapons and large capacity ammunition feeding devices Section 501(a)(1) of title I of the Omnibus Crime Control and Safe Streets Act of 1968 ( 34 U.S.C. 10152(a)(1) ) is amended by adding at the end the following: (J) Compensation for surrendered semiautomatic assault weapons and large capacity ammunition feeding devices, as those terms are defined in section 921 of title 18, United States Code, under buy-back programs for semiautomatic assault weapons and large capacity ammunition feeding devices. . 516. Ban on untraceable and undetectable firearms (a) Requirement that all firearms be traceable (1) Definitions Section 921(a) of title 18, United States Code, as amended by section 511 of this Act, is amended— (A) in paragraph (3)— (i) by inserting , including an unfinished frame or receiver after such weapon ; and (ii) by striking or (D) any destructive device and inserting