A firearm magazine extender is installable onto a firearm magazine having a lower end portion from which magazine flanges project. Embodiments of the firearm magazine extender include a first enclosure piece, a second enclosure piece, and a laterally-interlocking interface formed between the first and second enclosure pieces. The first enclosure piece includes, in turn, laterally-flexible sidewalls spaced along a lateral axis of the firearm magazine extender, and retention slots formed in the laterally-flexible sidewalls and into which the magazine flanges engage when the first enclosure piece is fit onto the firearm magazine. The second enclosure piece is configured to matingly engage the first enclosure piece and cooperate therewith to enclose the lower end portion of the firearm magazine. The laterally-interlocking interface inhibits deflection of the laterally-flexible sidewalls and disengagement of the magazine flanges from the retention slots when the firearm magazine extender is installed on the firearm magazine.

A firearm magazine extender is installable onto a firearm magazine having a lower end portion from which magazine flanges project. Embodiments of the firearm magazine extender include a first enclosure piece, a second enclosure piece, and a laterally-interlocking interface formed between the first and second enclosure pieces. The first enclosure piece includes, in turn, laterally-flexible sidewalls spaced along a lateral axis of the firearm magazine extender, and retention slots formed in the laterally-flexible sidewalls and into which the magazine flanges engage when the first enclosure piece is fit onto the firearm magazine. The second enclosure piece is configured to matingly engage the first enclosure piece and cooperate therewith to enclose the lower end portion of the firearm magazine. The laterally-interlocking interface inhibits deflection of the laterally-flexible sidewalls and disengagement of the magazine flanges from the retention slots when the firearm magazine extender is installed on the firearm magazine.

A modular firearm grip assembly has a frame defined by a front grip strap and a rear grip strap. The front grip strap defines a front lateral attachment point and rear lateral attachment point, and the rear grip strap has a first attachment coupling interface. A grip extension defined by a front extension strap and a rear extension strap is coupled to the frame at the respective one of the front lateral attachment point and the rear lateral attachment point thereof. The grip extension includes a second attachment coupling interface engaged to the first attachment coupling interface of the frame.

A modular firearm grip assembly has a frame defined by a front grip strap and a rear grip strap. The front grip strap defines a front lateral attachment point and rear lateral attachment point, and the rear grip strap has a first attachment coupling interface. A grip extension defined by a front extension strap and a rear extension strap is coupled to the frame at the respective one of the front lateral attachment point and the rear lateral attachment point thereof. The grip extension includes a second attachment coupling interface engaged to the first attachment coupling interface of the frame.

A rifle includes a magazine well, a barrel, an exo-bolt, and a rear magazine support. The barrel is detachably coupled to the magazine well. The barrel includes a forward barrel portion on an end of the barrel opposite the magazine well. The exo-bolt is configured to travel along an exterior of the barrel. The rear magazine support is coupled to the magazine well and opposite the barrel. The rear magazine support is configured to come forward toward the barrel and be secured in a plurality of distances from the barrel to adjust a length of the magazine well.

A rifle includes a magazine well, a barrel, an exo-bolt, and a rear magazine support. The barrel is detachably coupled to the magazine well. The barrel includes a forward barrel portion on an end of the barrel opposite the magazine well. The exo-bolt is configured to travel along an exterior of the barrel. The rear magazine support is coupled to the magazine well and opposite the barrel. The rear magazine support is configured to come forward toward the barrel and be secured in a plurality of distances from the barrel to adjust a length of the magazine well.

Provided is an increased capacity firearm ammunition magazine with a metallic body. The body is dimensioned to compatibly replace a (OEM) polymer or polymer over metal single stack magazine. The body has walls with exterior dimensions compatibly matching those of the OEM magazine and that are thinner than those of the OEM magazine. The thinner walls allow an at least partially laterally offset arrangement of cartridges therein. A longitudinal exterior ridge extends along a forward wall of the body and is configured from the metallic body walls and sized to compensate for forward-to-aft dimensioning difference compared to that of the OEM magazine.

Provided is an increased capacity firearm ammunition magazine with a metallic body. The body is dimensioned to compatibly replace a (OEM) polymer or polymer over metal single stack magazine. The body has walls with exterior dimensions compatibly matching those of the OEM magazine and that are thinner than those of the OEM magazine. The thinner walls allow an at least partially laterally offset arrangement of cartridges therein. A longitudinal exterior ridge extends along a forward wall of the body and is configured from the metallic body walls and sized to compensate for forward-to-aft dimensioning difference compared to that of the OEM magazine.

Provided is an increased capacity firearm ammunition magazine with a metallic body. The body is dimensioned to compatibly replace a (OEM) polymer or polymer over metal single stack magazine. The body has walls with exterior dimensions compatibly matching those of the OEM magazine and that are thinner than those of the OEM magazine. The thinner walls allow an at least partially laterally offset arrangement of cartridges therein. A longitudinal exterior ridge extends along a forward wall of the body and is configured from the metallic body walls and sized to compensate for forward-to-aft dimensioning difference compared to that of the OEM magazine.

Provided is an increased capacity firearm ammunition magazine with a metallic body. The body is dimensioned to compatibly replace a (OEM) polymer or polymer over metal single stack magazine. The body has walls with exterior dimensions compatibly matching those of the OEM magazine and that are thinner than those of the OEM magazine. The thinner walls allow an at least partially laterally offset arrangement of cartridges therein. A longitudinal exterior ridge extends along a forward wall of the body and is configured from the metallic body walls and sized to compensate for forward-to-aft dimensioning difference compared to that of the OEM magazine.