SECTION 1. SHORT TITLE.

    This Act may be cited as the ``Large Capacity Ammunition Feeding 
Device Act of 2013''.

SEC. 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, including any such device joined or 
                coupled with another in any manner, that has a capacity 
                of, or that can be readily restored or converted to 
                accept, more than 10 rounds of ammunition; and
                    ``(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 title 18, United States Code, 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 the Large 
Capacity Ammunition Feeding Device Act of 2013.
    ``(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;
            ``(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 that retirement; or
            ``(D) a manufacture, transfer, or possession of a large 
        capacity ammunition feeding device by a licensed manufacturer 
        or licensed importer for the purposes of testing or 
        experimentation authorized by the Attorney General.''.
    (c) Penalties.--Section 924 of title 18, United States Code, is 
amended--
            (1) in subsection (a), by adding at the end the following:
    ``(8) Whoever knowingly violates section 922(v) shall be fined 
under this title, imprisoned not more than 10 years, or both.''; and
            (2) in subsection (d)--
                    (A) in paragraph (1)--
                            (i) by striking ``Any firearm or 
                        ammunition'' and inserting ``Any firearm, 
                        ammunition, or large capacity ammunition 
                        feeding device'';
                            (ii) by striking ``or (k)'' and inserting 
                        ``(k), or (v)'';
                            (iii) by striking ``or any firearm or 
                        ammunition'' and inserting ``or any firearm, 
                        ammunition, or large capacity ammunition 
                        feeding device''; and
                            (iv) by striking ``firearms or ammunition'' 
                        and inserting ``firearms, ammunition, or large 
                        capacity ammunition feeding devices'' each 
                        place the term appears; and
                    (B) in paragraph (3)(E), by inserting ``922(v),'' 
                after ``922(n),''.
    (d) Identification and Markings.--Section 923(i) of title 18, 
United States Code, is amended--
            (1) by striking ``Licensed importers'' and inserting the 
        following: ``(1) Licensed importers''; and
            (2) by adding at the end the following:
    ``(2) A large capacity ammunition feeding device manufactured by 
any person after the date of enactment of the Large Capacity Ammunition 
Feeding Device Act of 2013 shall be identified by a serial number and 
the date on which the device was manufactured, and such other 
identification as the Attorney General may by regulation prescribe.''.
Output: Large Capacity Ammunition Feeding Device Act of 2013 - Amends the Brady Handgun Violence Prevention Act to prohibit: (1) the transfer or possession of a large capacity ammunition feeding device, except for such a device lawfully possessed within the United States on or before the date of this Act's enactment; and (2) the importation or bringing into the United States of such a device. Exempts: (1) the transfer or possession of such a device by a federal, state, or local agency or law enforcement officer; (2) certain transfers to licensees under the Atomic Energy Act of 1954; (3) possession of such a device transferred to an individual upon retirement from a law enforcement agency if such individual is not otherwise prohibited from receiving ammunition; and (4) the manufacture, transfer, or possession of such a device by a licensed manufacturer or importer for authorized testing or experimentation purposes. Sets penalties for violations. Subjects devices used or involved in knowing violation of such Act to seizure and forfeiture. Requires a large capacity ammunition feeding device manufactured after this Act's enactment to be identified by a serial number and the date it was manufactured.