of the Omnibus Crime Control and Safe Streets Act of 1968 ( 42 U.S.C. 3751(a)(1) ) is amended by adding at the end the following: (H) 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. . 515. 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 this Act, is amended— (A) in paragraph (3)— (i) by inserting , including an unfinished frame or receiver after such weapon