Magpul ACS (Adaptable Carbine Storage) Milspec Stock.

Magpul Adaptive Carbine Storage stock is a medium weight at .75lbs. The ACS stock is a drop-in replacement for the standard M4 stock body, offering an integral storage compartment, removable battery tubes, and a friction locking system to eliminate excessive stock movement or wiggle.

LOP is adjustable from 11.1 inches to 14.4 inches

Optional QD swivel can be added at accessory hole. The QD swivel is not included with the stock.