Hey guys, I recently got ahold of some new 9mm SMG spec GM barrels for my semi auto McKay build Uzi (with an Israeli kit trunnion and SMG feed ramp). I've noticed that the top left edge of the chamber side of the barrel has been getting contacted by the semi auto bolt I'm running. I read in a few places that the GM barrels have been known to have these issues sometimes, along with the inner diameter of the chamber being rough and causing feeding issues. Anyone have a similar issue, and was able to resolve it at home? I don't have access to a machine shop with a lathe unfortunately.