Sons of Liberty Gun Works AR-15 L89 Pinned and Welded Upper Receiver Assembly 5.56x45mm 14.5" Barrel 13.75" L89 M-LOK Rail with HUXWRX Flash Hider

Sons of Liberty Gun Works L89 V2 Complete Upper Receiver 223 Wylde/556NATO 14.5" Button-Rifled Barrel HUXWRX Flash Hider Low Profile Gas Block Black. This system clamps the rail onto the steel barrel nut with extreme force and precision while also driving the handguard rearward towards the upper receiver. The slightly larger ID of that extrusion gives you more real estate around the gas block even more rigidity than the M76 and takes longer to heat. Specifications for Sons of Liberty Gun Works L89: Manufacturer: Sons of Liberty Gun Works Caliber: 5.56x45mm NATO Finish: Black Color: Black Additional Features: Button-Rifled Low Profile Gas Block Upper Included Accessories: A2 Flash Hider Handle Color: Black Features of Sons of Liberty Gun Works L89: Hard Anodized Finish Black Package Contents: Sons of Liberty Gun Works L89