; (II) in subparagraph (B), in the matter preceding clause (i), by inserting functional before firearm ; and (III) in subparagraph (D)(ii), by inserting functional before firearm ; and (ii) in paragraph (4), by striking all or part of the firearm and all that follows through person. and inserting the following: all or part of the functional firearm, or otherwise make the presence of the functional firearm known to another person, in order to intimidate that person, regardless of whether the functional firearm is directly visible to that person. ; (C) in subsection (d)(1), as amended by section 512 of this Act, by striking or (w) and inserting (w), or (cc) ; and (D) in subsection (e)(1), by inserting through the possession of a functional firearm before and has three . (b) Modernization of the prohibition on undetectable firearms Section 922(p) of title 18, United States Code, is amended— (1) in the matter preceding paragraph (1), by striking any firearm ; (2) in paragraph (1)— (A) by striking subparagraph (A) and inserting the following: (A) an undetectable firearm; or ; and (B) in subparagraph (B), by striking any major component of which, when subjected to inspection by the types of x-ray machines commonly used at airports, does not generate and inserting the following: a major component of a firearm which, if subjected to inspection by the types of detection devices commonly used at airports for security screening, would not generate ; (3) by striking paragraph (2) and inserting the following: (2) For purposes of this subsection— (A) the term detectable material means any material that creates a magnetic field equivalent to or more than 3.7 ounces of 17–4 pH stainless steel; (B) the term major component , with respect to a firearm— (i) means the slide or cylinder or the frame or receiver of the firearm; and (ii) in the case of a rifle or shotgun, includes the barrel of the firearm