Sons of Liberty Gun Works, M76, M-LOK Handguard, Nitride Finish, Black, 15", Fits AR-15, with Quick Detach Socket WARNING: This product can expose you to chemicals including lead, which is known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to www.P65Warnings.ca.gov. 15" Length Inside Diameter 1.3" Hard Coat Anodized Steel Barrel Nut Includes QD Socket Designed for a precise and tight fit into the upper, Sons of Libertys M76 Handguard uses a proprietary wedge lock system. This system keeps the handguard tight against the barrel nut and upper receiver. Features a full length picatinny top rail, MLOK on the 3, 6, and 9 O'Clock positions, and a QD Socket. Black Hard Coat Anodized Finish to withstand the elements.