Replaces everything after the enacting clause. Amends the Criminal Code of 1961. Changes the exemption from the unlawful use of weapons statute and the aggravated unlawful use of a weapon statute for military re-enacting. Provides that the exemption applies to a person possessing a rifle with a barrel or barrels less than 16 inches in length if: (A) the person has been issued a Curios and Relics license from the U.S. Bureau of Alcohol, Tobacco, Firearms and Explosives; or (B) the person is an active member of a bona fide, nationally recognized military re-enacting group and the modification is required and necessary to accurately portray the weapon for historical re-enactment purposes; the re-enactor is in possession of a valid and current re-enacting group membership credential; and the overall length of the weapon as modified is not less than 26 inches. Retains provision that during transportation, any such weapon shall be broken down in a non-functioning state, or not immediately accessible.