The 6 position adjustable stock is equipped with an aluminum civilian (commercial) buffer tube, slot for tactical sling attachment, Scorpion Recoil System (absorbs recoil energy) and 3M Industrial Grade Self-Adhesive Soft Touch Cheekrest Pad. Features DuPont® Extreme Temperature Glass Reinforced Polymer construction. The stock includes a buffer spring, recoil buffer, locking ring, sling swivel stud and castle nut. Note: Pistol grip uses original mounting hardware for installation. AR-15 stock with cheekrest must be extended 3" to operate charging handle. Not compatible with .308 rifles.