(a) Firearms and ammunition may be brought into the United States or any possession thereof by any person who can establish to the satisfaction of Customs that such firearm or ammunition was previously taken out of the United States or any possession thereof by such person. Registration on Customs Form 4457 or on any other registration document available for this purpose may be completed before departure from the United States at any U.S. customhouse or any office of an Director of Industry Operations. A bill of sale or other commercial document showing transfer of the firearm or ammunition in the United States to such person also may be used to establish proof that the firearm or ammunition was taken out of the United States by such person. Firearms and ammunition furnished under the provisions of section 925(a)(3) of the Act to military members of the U.S. Armed Forces on active duty outside of the United States also may be imported into the United States or any possession thereof by such military members upon establishing to the satisfaction of Customs that such firearms and ammunition were so obtained.

(b) Firearms, firearm barrels, and ammunition may be imported or brought into the United States by or for the United States or any department or agency thereof, or any State or any department, agency, or political subdivision thereof. A firearm, firearm barrel or ammunition imported or brought into the United States under this paragraph may be released from Customs custody upon a showing that the firearm, firearm barrel or ammunition is being imported or brought into the United States by or for such a governmental entity.

(c) The provisions of this subpart shall not apply with respect to the importation into the United States of any antique firearm.

(d) Firearms and ammunition are not imported into the United States, and the provisions of this subpart shall not apply, when such firearms and ammunition are brought into the United States by:

(1) A nonresident of the United States for legitimate hunting or lawful sporting purposes, and such firearms and such ammunition as remains following such shooting activity are to be taken back out of the territorial limits of the United States by such person upon conclusion of the shooting activity;

(2) Foreign military personnel on official assignment to the United States who bring such firearms or ammunition into the United States for their exclusive use while on official duty in the United States, and such firearms and unexpended ammunition are taken back out of the territorial limits of the United States by such foreign military personnel when they leave the United States;

(3) Official representatives of foreign governments who are accredited to the U.S. Government or are en route to or from other countries to which accredited, and such firearms and unexpended ammunition are taken back out of the territorial limits of the United States by such official representatives of foreign governments when they leave the United States;

(4) Officials of foreign governments and distinguished foreign visitors who have been so designated by the Department of State, and such firearms and unexpended ammunition are taken back out of the territorial limits of the United States by such officials of foreign governments and distinguished foreign visitors when they leave the United States; and

(5) Foreign law enforcement officers of friendly foreign governments entering the United States on official law enforcement business, and such firearms and unexpended ammunition are taken back out of the territorial limits of the United States by such foreign law enforcement officers when they leave the United States.

(e) Notwithstanding the provisions of paragraphs (d) (1), (2), (3), (4) and (5) of this section, the Secretary of the Treasury or his delegate may in the interest of public safety and necessity require a permit for the importation or bringing into the United States of any firearms or ammunition.

[33 FR 18555, Dec. 14, 1968. Redesignated at 40 FR 16835, Apr. 15, 1975, and amended by T.D. ATF-58, 44 FR 32367, June 6, 1979; T.D. ATF-270, 53 FR 10500, Mar. 31, 1988; T.D. ATF-471, 67 FR 5426, Feb. 5, 2002]