((a)) ** Definitions** In this section, the terms “handgun”, “rifle”, “shotgun”, “firearm”, “ammunition”, “machinegun”, “short-barreled shotgun”, and “short-barreled rifle” have the meanings given the terms in .section 921(a) of title 18

((b)) ** Authorization** Notwithstanding subsections (a)(4), (a)(5), (b)(2), (b)(4), and () of , , , and any law (including regulations) of a State or a political subdivision of a State that prohibits the transfer, receipt, possession, transportation, importation, or use of a handgun, a rifle, a shotgun, a short-barreled shotgun, a short-barreled rifle, a machinegun, a semiautomatic assault weapon, ammunition for any such gun or weapon, or a large capacity ammunition feeding device, in carrying out the duties of the Commission, the Commission may authorize the security personnel of any licensee or certificate holder of the Commission (including an employee of a contractor of such a licensee or certificate holder) to transfer, receive, possess, transport, import, and use 1 or more such guns, weapons, ammunition, or devices, if the Commission determines that—

((1)) the authorization is necessary to the discharge of the official duties of the security personnel; and

((2)) the security personnel—

((A)) are not otherwise prohibited from possessing or receiving a firearm under Federal or State laws relating to possession of firearms by a certain category of persons;

((B)) have successfully completed any requirement under this section for training in the use of firearms and tactical maneuvers;

((C)) are engaged in the protection of—

((i)) a facility owned or operated by a licensee or certificate holder of the Commission that is designated by the Commission; or

((ii)) radioactive material or other property owned or possessed by a licensee or certificate holder of the Commission, or that is being transported to or from a facility owned or operated by such a licensee or certificate holder, and that has been determined by the Commission to be of significance to the common defense and security or public health and safety; and

((D)) are discharging the official duties of the security personnel in transferring, receiving, possessing, transporting, or importing the weapons, ammunition, or devices.

((c)) ** Background checks** A person that receives, possesses, transports, imports, or uses a weapon, ammunition, or a device under subsection (b) shall be subject to a background check by the Attorney General, based on fingerprints and including a background check under section 103(b) of the Brady Handgun Violence Prevention Act (; note)  to determine whether the person is prohibited from possessing or receiving a firearm under Federal or State law.Public Law 103–15918 U.S.C. 9221

((d)) ** Effective date** This section takes effect on the date on which guidelines are issued by the Commission, with the approval of the Attorney General, to carry out this section.