; or (D) and inserting or (C) ; and (2) by striking paragraph (24). (b) Penalties Section 924 of such title is amended— (1) in subsection (c)(1)— (A) in paragraph (1)(B)(ii) by striking , or is equipped with a firearm silencer or firearm muffler ; and (B) in paragraph (1)(C), by striking or is equipped with a firearm silencer or firearm muffler, ; and (2) in subsection (o), by striking or is equipped with a firearm silencer or muffler, . (c) Carrying of concealed firearms by qualified law enforcement officers Section 926B(e)(3) of such title is amended— (1) in subparagraph (A), by adding and at the end; (2) by striking subparagraph (B); and (3) by redesignating subparagraph (C) as subparagraph (B). (d) Carrying of concealed firearms by qualified retired law enforcement officers Section 926C(e)(1)(C) of such title is amended— (1) in clause (i), by adding and at the end; and (2) by striking clause (ii).