Complete 9" Upper .300blk

Complete 9

This complete upper assembly makes it easy to convert your 5.56mm AR to 300 AAC BLACKOUT (7.62x35mm).The complete upper comes with the Knights Armament URXIII Rail, has a 4150 steel barrel features a black nitride finish (including bore and chamber), 1:7" twist for super- or sub-sonic use. It comes ready for silencer use, threaded 5/8-24 and comes with the 51T Blackout Flash Hider. The bolt carrier group is the Full Auto BCG with the Carpenter 158 steel bolt, internally chrome lined with O-Ring. THIS UPPER DOES COME WITH THE NEWER KAC URX III RAIL 

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