; and (iv) in paragraph (6)— (I) in subparagraph (A), by striking a juvenile defendant's parent or legal guardian and inserting the parent or legal guardian of a defendant who is less than 21 years of age ; and (II) in subparagraph (C), by striking a juvenile defendant and inserting a defendant who is less than 21 years of age ; and (2) in section 924(a)(6)— (A) in subparagraph (A)— (i) in clause (i), by striking juvenile each place the term appears and inserting person who is less than 21 years of age ; and (ii) in clause (ii)— (I) in the matter preceding subclause (I), by striking juvenile and inserting person who is less than 21 years of age ; (II) in subclause (I)— (aa) by striking juvenile and inserting person who is less than 21 years of age ; and (bb) by striking handgun or ammunition and inserting covered firearm or covered ammunition ; and (III) in subclause (II), by striking juvenile has and inserting person who is less than 21 years of age has ; and (B) in subparagraph (B)— (i) by striking juvenile each place the term appears and inserting person who is less than 21 years of age ; and (ii) by striking handgun or ammunition each place the term appears and inserting covered firearm or covered ammunition .