? 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.