The Fab Defense GL-Shock AR-15 Stock has a sleek design to prevent it form snacking or getting caught on the shooters gear. The rubber butt pad has a ribbed non slip design. Ambidextrous quick detach sling swivel mounts allow the shooter to use a sling on either side of the stock. A watertight storage compartment is big enough for two CR123 batteries. Made from a reinforced polymer composite. Fits both Mil-Spec and Commercial 6 position buffer tubes. This version includes an adjustable cheek rest.