The BDS Tactical Butt Stock Magazine Pouch is designed to fit either M4 style collapsible stocks and full size M16 style stocks. The pouch is designed to carry (1) 30 round GI style 5.56 magazine. The lid consists of a hook and loop closure and a 1" reverse pull tab for easy access. All mounting hardware is included for full and collapsible butt stocks. And as with all BDS Tactical Gear products, this is made in Oceanside, CA USA and carries our Lifetime Warranty.