Warne Mountain Tech Rails offer the full package. No need to sacrifice weight for durability, or fitment for versatility. Warne uses aerospace-grade materials to cover you from all angles. The 7664-20MOA offers 20 MOA of elevation built in for longer distance shooting. Fits Picatinny and Weaver style mounts and are NATO-STANAG compatible. Mounts to receiver with 8-40″ Length Screws.