Gas-operated firearms, in which the gas system guides gas selectively from the gas removal bore to a gas pipe, with a platelet, movable between at least two positions in the gas system. The platelet may be pivotable about a pivot axis pin. A stop pin, parallel to the pivot axis pin, may protrude into a stop bore of the platelet, thus delimiting the pivoting. The platelet may have at least two recessed catch positions, into which a catch, under the effect of a catch spring, optionally engages, provided that the gas through-bore associated with the catch comes to rest in alignment between the gas bores when the catch engages in one of the recesses.

Firearms, with gas-operated reloading, having a gas block that includes a gas pressure selector movable between at least two positions. For smooth operation, the gas pressure selector in the gas block is rotatable into at least two positions about its primary axis and is also designed to be axially displaceable along the same primary axis between at least two positions. The gas block includes a stop pin that is arranged to cooperate with a control surface of the gas pressure selector with complementary form and function, and further includes a locking device having a spring-loaded locking pin that can yield normally to the primary axis to temporarily lock the gas pressure selector in a predetermined position.

Firearms, with gas-operated reloading, having a gas block that includes a gas pressure selector movable between at least two positions. For smooth operation, the gas pressure selector in the gas block is rotatable into at least two positions about its primary axis and is also designed to be axially displaceable along the same primary axis between at least two positions. The gas block includes a stop pin that is arranged to cooperate with a control surface of the gas pressure selector with complementary form and function, and further includes a locking device having a spring-loaded locking pin that can yield normally to the primary axis to temporarily lock the gas pressure selector in a predetermined position.

A detachable Gas Key, which attaches to a Bolt Carrier, which provides gas to power the action of a semi automatic or select fire firearm. Improvements are made in both the attachment strength, as well as a significantly improved seal between the Gas Key and the Bolt Carrier.

A detachable Gas Key, which attaches to a Bolt Carrier, which provides gas to power the action of a semi automatic or select fire firearm. Improvements are made in both the attachment strength, as well as a significantly improved seal between the Gas Key and the Bolt Carrier.

Gas-operated firearms, in which the gas system guides gas selectively from the gas removal bore to a gas pipe, with a platelet, movable between at least two positions in the gas system. The platelet may be pivotable about a pivot axis pin. A stop pin, parallel to the pivot axis pin, may protrude into a stop bore of the platelet, thus delimiting the pivoting. The platelet may have at least two recessed catch positions, into which a catch, under the effect of a catch spring, optionally engages, provided that the gas through-bore associated with the catch comes to rest in alignment between the gas bores when the catch engages in one of the recesses.

Gas-operated firearms, in which the gas system guides gas selectively from the gas removal bore to a gas pipe, with a platelet, movable between at least two positions in the gas system. The platelet may be pivotable about a pivot axis pin. A stop pin, parallel to the pivot axis pin, may protrude into a stop bore of the platelet, thus delimiting the pivoting. The platelet may have at least two recessed catch positions, into which a catch, under the effect of a catch spring, optionally engages, provided that the gas through-bore associated with the catch comes to rest in alignment between the gas bores when the catch engages in one of the recesses.

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.

A shear resistant bolt carrier and gas key are provided having a mating recoil lug and recoil lug slot that transfer shear forces between the gas key and bolt carrier to reduce and eliminate shear forces on the screw attachment points and eliminate a point of failure in the bolt carrier group (BGC).

A shear resistant bolt carrier and gas key are provided having a mating recoil lug and recoil lug slot that transfer shear forces between the gas key and bolt carrier to reduce and eliminate shear forces on the screw attachment points and eliminate a point of failure in the bolt carrier group (BGC).