Home / Hunting / Sons Of Liberty Gun Works / Sons of Liberty Gun Works M4 L89 AR-15 Upper Receiver Assembly 5.56x45mm NATO 13.7" Barrel
Sons of Liberty Gun Works M4 L89 AR-15 Upper Receiver Assembly 5.56x45mm NATO 13.7" Barrel
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May 26, 2026
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Description
These Sons of Liberty Gun Works L89 Upper Receiver Groups are built using a forged upper. These uppers have V2 Button rifled barrels, V2 4140 gas block, and offered in a variety of length and muzzle device options. L89 rails have 7-sided MLOK, and integral QD's for maximum available MLOK utilization. FeaturesButton Rifled BarrelM-LOK RailOptions with Installed Muzzle Devices are Pin and Welded
