DealAssembled 10.5" Pistol/ SBR AR15 Upper Receiver with 10" Quad Rail 10" Quad Rail Carbine Length Gas Tube with Low Profile Gas Block 10.5" 223/556 Wylde Phosphated Barrel M4 Upper Receiver with Ejection Port and Forward Assist Installed A2 Muzzle Break with Crush Washer No BCG or charging handle included Most, but not all lower receivers, require additional work/ sub-sequential parts to cycle correctly with a pistol/SBR upper receiver. A stiffer spring and/or heavier buffer may be needed to cycle correctly. from Dean Sports (Product 10.5-WYLDE-QUADRAIL) |