FAB Defense GL-Shock CP AR-15 Buttstock - Black - The patented GL-Shock Buttstock features a recoil-reducing anti-rattle system with a premium spring for improved control and comfort. Built from reinforced Mil-Spec polymer, it fits both Mil-Spec and commercial tubes and includes watertight battery storage, a non-slip rubber butt pad, QD sling points, an adjustable cheek rest, and a durable black finish. Features Anti-Rattle Mechanism; Inversed Positioning Lever; Integral Ribbed Rubber Butt Pad with a Non Slip Design; Integrated Quick Detach Sling Swivel Connectors on Both Sides; Watertight Battery Storage; Fits Perfectly on Both Tubes; Made from Mill-Spec Reinforced Composite Polymer; Adjustable Cheek Rest;