BA 8.3" AR 9mm barrel with 1/2-28 threads. Feed ramp has been slightly contoured and polished to ensure reliability. I'm the 2nd owner of this barrel. Bought from friend and it ran 100% with his non QC10 lower(different mag angle as I understand it). $58 shipped USPS with tracker.
http://i.imgur.com/EKfqwfRl.jpg
http://i.imgur.com/yzFDoIMl.jpg
http://i.imgur.com/mZIolwrl.jpg
