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This collapsible buttstock features six-position length-of-pull adjustment, similar to the USGI M4 carbine stock, making it ideal for shooters of varying sizes, including those wearing body armor. It can be easily installed on any standard AR-15 rifle or carbine lower receiver, complete with a 1.17" diameter commercial buffer tube, receiver lock plate, lock nut, toe-mounted steel sling loop, carbine recoil spring, and buffer. This enables you to convert your fixed-stock, flattop rifle into an M4 carbine configuration without permanently modifying your gun. Constructed from fiberglass-reinforced, injection-molded nylon, the buttstock is incredibly tough and can resist impact, moisture, heat, extreme cold, and most cleaning solvents. The stock's interior diameter is designed to match the buffer tube O.D. for a secure fit that eliminates unwanted play and rattles that may reveal your position. The steel lock nut comes with four square notches and pre-cut detents for staking to lock plate. The heavy-duty, machined aluminum receiver extension is hardcoat anodized for extra strength, making it perfect for tough tactical operations.