1. Short title This Act may be cited as the Keep Americans Safe Act . 2. Prohibition on transfer or possession of large capacity ammunition feeding devices (a) Definition Section 921(a) of title 18, United States Code, is amended by inserting after paragraph (29) the following: (30) The term large capacity ammunition feeding device — (A) means a magazine, belt, drum, feed strip, or similar device that has a capacity of, or that can be readily restored or converted to accept, more than 10 rounds of ammunition; but (B) does not include an attached tubular device designed to accept, and capable of operating only with, .22 caliber rimfire ammunition. . (b) Prohibitions Section 922 of such title is amended by inserting after subsection (u) the following: (v) (1) (A) (i) Except as provided in clause (ii), it shall be unlawful for a person to transfer or possess a large capacity ammunition feeding device. (ii) Clause (i) shall not apply to the possession of a large capacity ammunition feeding device otherwise lawfully possessed within the United States on or before the date of the enactment of this subsection. (B) It shall be unlawful for any person to import or bring into the United States a large capacity ammunition feeding device. (2) Paragraph (1) shall not apply to— (A) a manufacture for, transfer to, or possession by the United States or a department or agency of the United States or a State or a department, agency, or political subdivision of a State, or a transfer to or possession by a law enforcement officer employed by such an entity for purposes of law enforcement (whether on or off duty); (B) a transfer to a licensee under title I of the Atomic Energy Act of 1954 for purposes of establishing and maintaining an on-site physical protection system and security organization required by Federal law, or possession by an employee or contractor of such a licensee on-site for such purposes or off-site for purposes of licensee-authorized training or transportation of nuclear materials