Add to Wish list Choose Options Quick view .300 Blackout Complete Upper 16″ Phosphate Barrel 15″ Keymod Rail $329.99 .300 Blackout Complete Upper 16″ Phosphate Barrel 15″ Keymod Rail AR-15 Flat Top Upper Receiver Forward Assist + Dust Cover 16" Phosphate .300 Blk Barrel Gas tube Gas Block Crush Washer + Flash Hider 15" Keymod Rail .223/5.56... Choose Options Add to Wish list