Collapsible buttstock provides convenient six-position length-of-pull adjustment to fit different-size shooters, including those wearing body armor. Ready to install on any standard AR-15 rifle or carbine lower receiver and mil spec buffer tube. Buttstock is made from extremely tough, fiberglass-reinforced, injection-molded nylon to resist impact, heat, moisture, extreme cold, and most cleaning solvents. Stock interior diameter is matched to buffer tube O.D. for a snug fit that eliminates un wanted play and rattles. SPECS: Aluminum and fiberglass-reinforced, injection-molded nylon, matte black.