? The first functional recoil-reducing collapsible stock for AR-15 carbines! ? Shoot faster accurately! ? Reduces recoil and muzzle rise to allow faster, more accurate fire. ? Provide comfort for 5.56 and large caliber M4/AR-15s, .308 AR-10s, and Mako shotgun kits. ? 5 sling attachment points, including 2 QR attachment points. ? Storage compartment for batteries or parts. ? MIL-SPEC reinforced polymer composite, steel hardware, rubber buttpad. ? Fits any weapon that accepts M-4/AR15 style stocks. ? Patented system reduces recoil and muzzle rise. ? Auto-tensioner for no-rattle fit on both mil-spec and commercial tubes! ? Comfortable rubber buttpad provides traction on body armor. ? Streamlined shape will not snag on gear. ? Cheek riser is adjustable for optimal height for optics.