The LWRC UCIW (Ultra-Compact Individual Weapon) stock system shortens the overall length of the firearm by a full inch as compared to a standard AR-15 collapsible stock assembly. This stock kit includes a compact receiver extension buffer tube, receiver end plate, shortened recoil buffer, recoil spring and castle nut. The system's components were designed to work together and should be installed together for reliable performance. The stock is lightweight and features integral sling attachment points, easy one-hand adjustments and an excellent cheekweld. The rubber buttpad prevents slippage during firing. The receiver extension has four positions to adjust the length of pull.