Prohibits possession of large-capacity ammunition magazines, and requires their disposal by sale to dealer, destruction, or removal from state. Requires most individuals to pass background check and obtain Department of Justice authorization to purchase ammunition. Requires most ammunition sales be made through licensed ammunition vendors and reported to Department of Justice. Requires lost or stolen firearms and ammunition be reported to law enforcement. Prohibits persons convicted of stealing a firearm from possessing firearms. Establishes new procedures for enforcing laws prohibiting firearm possession by felons and violent criminals. Requires Department of Justice to provide information about prohibited persons to federal National Insta...