Magpul ACS (adaptive Carbine Storage) AR-15 Collapsible Buttstock - Mil-Spec
The patented Magpul ACS (Adaptable Carbine/Storage) – Mil-Spec Model is a drop-in replacement butt-stock for AR15/M16 carbines using mil-spec sized receiver extension tubes. A streamlined, anti-snag profile shields the release latch to prevent accidental activation. Similar to the Magpul CTR®, the ACS also features a supplemental friction lock system that minimizes excessive stock movement 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 0.30" thick rubber butt-pad which provides positive shoulder purchase to prevent slippage even with body armor or modular gear.
Posted by Brad on 10th Dec 2012
The storage compartments make for nice cheek rest, good grip with the rubber pad, and another thing to add, it adds some length to the rifle. Check the measurements for exact size diff, but I think its about and half inch...maybe more. Don't have it in front of me to measure right now.
Posted by Road Dog on 9th Nov 2012
For my first build I chose this unit because of the utility. After firing the rifle I realized it makes shooting easier, the rubber is nice. It is very stable when locked.