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Sons of Liberty Gun Works (SOLGW) M4 89 300BLK 10.5″ Upper – Black
Sons of Liberty Gun Works M4-89 Complete Upper300 Blackout9″ Combat Barrel1:7″ TwistQPQ FinishBlack8″ M89 M-LOK HandguardA2 Flash HiderFeatures:300BLKComplete Upper Receiver9 Combat Barrel8 M89 HandguardA2 Flash Hider