The 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.