SEC. 3. BAN OF LARGE CAPACITY AMMUNITION FEEDING DEVICES.
(a) PROHIBITION- Section 922 of title 18, United States Code, as amended by section 2(a), is amended by adding after subsection (v) the following:
`(w)(1) Except as provided in paragraph (2), it shall be unlawful for a person to transfer or possess a large capacity ammunition feeding device.
`(2) Paragraph (1) shall not apply to the possession or transfer of any large capacity ammunition feeding device otherwise lawfully possessed on or before the date of the enactment of this subsection.
`(3) This subsection shall not apply to--
`(A) the manufacture for, transfer to, or possession by the United States or a department or agency of the United States (including the United States Armed Forces and, under regulations pursuant to title 50, United States Code, the National Guard and Reserve), 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) the 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 licensee on-site for such purposes or off-site for purposes of licensee-authorized training or transportation of nuclear materials;
`(C) the possession, by an individual who is retired from service with a law enforcement agency and is not otherwise prohibited from receiving ammunition, of a large capacity ammunition feeding device transferred to the individual by the agency upon such retirement; or
`(D) the manufacture, transfer, or possession of any large capacity ammunition feeding device by a licensed manufacturer or licensed importer for the purposes of testing or experimentation authorized by the Secretary.'.