I was shooting some Wolf 223 out of a 20" Extra Heavy bbl AR to see if the gun worked and after the 3rd or 4th shot go no worky! I'm hoping that it's related to a tight chamber. The bbl has no markings whatsoever on it so I had to guess 5.56/.223. I couldn't get the case out of the chamber in the field so I had to wait until I got home. The case was not bulged or anything but it did have a coulpe long scratches in the lacquer. I attributed those from the bolt riding over it in the magazine and then loading it into the chamber. Cleaned the rifle up pretty good and the chamber looks pristine.