Abstract: In a method of converting a semi-automatic rifle to a single shot rifle, a production semi-automatic rifle converted to a single shot rifle includes: a) conventional rifle components, including a receiving trigger, trigger guard, barrel; b) a semi-automatic firing mechanism including a gas actuated casing ejection and bolt reset mechanism including a bolt carrier with two carrier gas key threaded receiving orifices and having no production carrier gas key and a having a dual-bored metal block gas blocking mechanism attached to the bolt carrier and positioned so as to inhibit semi-automatic operation of the semi-automatic rifle by disabling the automatic gas actuated casing ejection and automatic gas actuated bolt reset functionality. In some embodiments, a modified charge handle has an extension with two attachment orifices corresponding to the metal block gas blocking mechanism orifices and is coincidentally attached to the bolt carrier.

Abstract: A production direct gas impingement semi-automatic AR-style rifle is converted to a single shot, straight pull bolt action rifle that includes: a) conventional rifle components, including an upper receiver and lower, trigger, trigger guard, barrel; b) a direct gas impingement semi-automatic firing mechanism including automatic gas actuated casing ejection, automatic gas actuated bolt and hammer reset, and automatic gas actuated cartridge reload functionality, including a bolt carrier with two production carrier gas key screw threaded receiving orifices and having no production carrier gas key, and a having a metal gas blocking and diverting mechanism attached to the bolt carrier in the place of a production carrier gas key. This inhibits semi-automatic operation of the rifle by disabling the automatic gas actuated casing ejection, bolt and hammer reset, and cartridge reload functionality.

Abstract: A production direct gas impingement semi-automatic AR-style rifle is converted to a single shot, straight pull bolt action rifle that includes: a) conventional rifle components, including an upper receiver and lower, trigger, trigger guard, barrel; b) a direct gas impingement semi-automatic firing mechanism including automatic gas actuated casing ejection, automatic gas actuated bolt and hammer reset, and automatic gas actuated cartridge reload functionality, including a bolt carrier with two production carrier gas key screw threaded receiving orifices and having no production carrier gas key, and a having a metal gas blocking and diverting mechanism attached to the bolt carrier in the place of a production carrier gas key. This inhibits semi-automatic operation of the rifle by disabling the automatic gas actuated casing ejection, bolt and hammer reset, and cartridge reload functionality.

Abstract: A production direct gas impingement semi-automatic AR-style rifle is converted to a single shot, straight pull bolt action rifle that includes: a) conventional rifle components, including an upper receiver and lower, trigger, trigger guard, barrel; b) a direct gas impingement semi-automatic firing mechanism including automatic gas actuated casing ejection, automatic gas actuated bolt and hammer reset, and automatic gas actuated cartridge reload functionality, including a bolt carrier with two production carrier gas key screw threaded receiving orifices and having no production carrier gas key, and a having a metal gas blocking and diverting mechanism attached to the bolt carrier in the place of a production carrier gas key. This inhibits semi-automatic operation of the rifle by disabling the automatic gas actuated casing ejection, bolt and hammer reset, and cartridge reload functionality.

Abstract: A production AR-style semi-automatic rifle (i.e. AR-15, AR-10, M-16, M-4, etc.) that has been converted to a single shot rifle includes: a) conventional rifle components, including a receiving trigger, trigger guard, barrel; b) a semi-automatic firing mechanism including a gas actuated casing ejection and bolt reset mechanism including a bolt carrier with two carrier gas key threaded receiving orifices and having no production carrier gas key and a having a dual-bored metal block gas blocking restrictor mechanism attached to the bolt carrier and positioned so as to inhibit\semi-automatic operation of the AR-style semi-automatic rifle by disabling the automatic gas actuated casing ejection and automatic gas actuated bolt reset functionality. In some embodiments, there is a modified charge handle having an extension with two attachment orifices corresponding to the metal block gas blocking restrictor mechanism orifices and is coincidentally attached to the bolt carrier.