M76 is the Newest rail system from Sons of Liberty Gun Works. Featuring the proven Wedge Lock locking system and a 4140 Steel barrel nut. The M76 is the pinnacle of rail development. The M76 does not have a built in QD socket. Instead, SOLGW has included an industry leading 4140 Steel M-LOK QD socket with every rail. Allowing you to place it where you want. The M76 Wedge Lock Rail is available in multiple lengths, including 8", 9.5", 10.5", 13", 15", and 16.5". Find the perfect length for your rifle! Mfg: Sons Of Liberty Gun Works