Arizona Armament LLC

ACS M4 Carbine Collapsible Butt-Stock – Military Model The patent-pending Magpul ACS (Adaptable Carbine/Storage – Military Model) is a drop-in replacement butt-stock for carbines using mil-spec receiver extension tubes. A streamlined, anti-snag profile shields the release latch to prevent accidental activation and the extra-power lock mechanism uses a premium chrome-silicon spring to avert auto-collapse failure by resisting spring relaxation. Similar to the CTR, the ACS also features a supplemental friction lock system that eliminates wobble for enhanced weapon stability and accuracy. Dual, rear accessible, water-resistant battery storage tubes and an integral storage compartment in the butt of the stock provides multiple storage options. The ACS comes standard with a rubber butt-pad which gives positive shoulder purchase to prevent slippage even with body armor or modular gear.