Thanks rKing for dimension confirmation. No visible bulges in base forward of extractor hook
Do I understand right that you're saying that my barrel should interchange with anyone whose gun is 800000 or higher serial? And that if the barrel itself has a serial # then it isn't compatible with this receiver? Our of curiosity & for my learning's sake, what makes them not interchangeable, is it a mechanical fit/obvious issue or something more subtle where the wrong barrel would fit but not work well?
Any way to tell if this barrel on the gun was the barrel that came with the gun from the factory?
I might have a chance to try some barrel swaps with the other guys, that's a good idea to try to 100% isolate things. The shell sticks so hard in there with the barrel off the gun that I feel like it has to be chamber/ammo related though. Not wanting to take the chamber past SAAMI spec it may be time to admit defeat and say it's a gun that will always be picky on ammo, hate to do that though.