Security Exemplar
(2) For purposes of this subsection— (A) the term “firearm” does not include the frame or receiver of any such weapon; (B) the term “major component” means, with respect to a firearm, the barrel, the slide or cylinder, or the frame or receiver of the firearm; and (C) the term “Security Exemplar” means an object, to be fabricated at the direction of the Attorney General, that is— (i) constructed of, during the 12-month period beginning on the date of the enactment of this subsection, 3.7 ounces of material type 17–4 PH stainless steel in a shape resembling a handgun; and (ii) suitable for testing and calibrating metal detectors: Provided, however , That at the close of such 12-month period, and at appropriate times thereafter the Attorney General shall promulgate regulations to permit the manufacture, importation, sale, shipment, delivery, possession, transfer, or receipt of firearms previously prohibited under this subparagraph that are as detectable as a “Security Exemplar” which contains 3.7 ounces of material type 17–4 PH stainless steel, in a shape resembling a handgun, or such lesser amount as is detectable in view of advances in state-of-the-art developments in weapons detection technology.