The patent-pending Magpul� ACS� (Adaptable Carbine/Storage � Military Model) is a drop-in replacement butt-stock for carbines using commercial 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.

Note: This is for a commercial M4 Carbine Receiver Extensions (buffer tube)

Color is Black.