The Military Model is a drop-in replacement butt-stock for carbines using mil-spec receiver extension tubes. Designed for light, and fast action the streamlined A-frame profile avoids snagging and shields the release latch to prevent sliping. The extra-power lock mechanism uses a premium chrome-silicon spring to avert auto-collapse failure and maintains strength by resisting spring relaxation. The Military Model includes a standard 0.30” rubber butt-pad which provides positive shoulder purchase to prevent slippage even with body armor or modular gear.