Revises subsection lettering and adds a new subsection governing transfers of ammunition: strikes existing subsection (s), redesignates subsection (t) as (s), makes specified insertions in the redesignated subsection (s), and inserts a new subsection (t) that makes it unlawful for unlicensed persons to transfer ammunition except where a licensed importer/manufacturer/dealer first takes possession to comply with subsection (s), imposes obligations on licensees who take possession, provides that returns to a transferor in certain circumstances are not transfers, enumerates exceptions, and requires licensees to provide notice and obtain a transferee certification on a form prescribed by the Attorney General.

Modifies the list of cross-references in the introductory matter of 922(y)(2) by removing certain parenthetical references and inserting a shorter cross-reference list.

Updates a cross-reference in the prefatory matter of section 925A from a reference to subsections (s) or (t) of section 922 to a reference to section 922(s).

Revises cross-references in both subsections (a) and (b) of section 925B to replace references to 922(t) with references to 922(s).

Updates cross-references within 34 U.S.C. 40901 and related statutory text (Brady Act / appropriations-related provisions) to reflect the redesignation of section 922 subsections; specifically, strikes occurrences of "(t)" and replaces with "(s)" in the specified paragraph, and in a related appropriations note inserts a reference to "subsection (s) or (t) of section 922."

Updates a cross-reference in 34 U.S.C. 40913(f) by replacing a reference to "922(t)" with "922(s)."