COMPLETE 9" UPPER .300BLK
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
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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