Product Overview
Sons of Liberty Gun Works AR-15 L89 Upper Receiver Assembly 5.56x45mm 14.5" Cold Hammer Forged Barrel 13.75" L89 M-LOK Rail. The Sons of Liberty Gun Works L89 Upper Receiver Groups are built using our forged upper receiver, Liberty Fighting Barrels with SOLGW 4140 gas block and nitrided gas tube. These uppers are built to the same standards as our legendary rifles, and are test fired before leaving the shop. The L89 rails have 7-sided MLOK slots, with integral QD’s at the barrel nut on the left and right side. The L89 features the Drivelock barrel nut system, anti-rotation tabs and an internal dowel pin between the upper/rail to all ensure a solid lockup, with minimal POI shifts for attached laser or other VAS systems.
