The Recoil-Reducing M4/AR-15 Stock reduces recoil and muzzle rise to allow faster, more accurate fire. It provides comfort for 5.56 and large caliber M4/AR-15s, .308 AR-10s, and Mako shotgun kits. It has 5 sling attachment points, including 2 QR attachment points. It has a storage compartment for batteries or parts. It is made of Mil-Spec reinforced polymer composite, steel hardware, rubber butt pad. This stock fits any weapon that accepts M-4/AR15 style stocks. It comes with an auto-tensioner for no-rattle fit on both mil-spec and commercial tubes. The comfortable rubber butt pad provides traction on body armor. It's streamlined shape will not snag on gear.