The only other thing that comes to mind you already have mentioned; The barrel..
Have you observed that the hang ups occur consistenly after a couple of shots or more like one works, the next does not, etc. I'm just speculating on the effect of heat on an out of spec. chamber. As the gun heats up, cases start sticking. Our own "Luger Doc" would be the man I would want looking at this issue, although I realize you prefer not to ship your gun..
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