Home / Gun Care & Accessories / Sons Of Liberty Gun Works / Sons of Liberty Gun Works M4 L89B AR-15 Complete Upper Receiver 5.56x45mm NATO 13.7" Barrel with Rotex Flash Hider
Sons of Liberty Gun Works M4 L89B AR-15 Complete Upper Receiver 5.56x45mm NATO 13.7" Barrel with Rotex Flash Hider
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Jul 4, 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 Rail
