Thanks for posting the links. I knew I had read about this problem before but was unable to find it after a half hour of searching.
My barrel appears to be "updated" since it is slightly rounded at the bottom rear of the chamber. My guide rod is also beveled. I thought those updates were supposed to eliminate this problem? It's a bit disconcerting that my gun, which should be the very latest version, has the problem. And it puzzles me as to why some guns exibit this wear and others don't. Is there an explanation for that?
Brian, has yours shown any of this wear after the updates were made to your gun?
Chris, you said, “I have had contact with Eric but - he would ask that folks wait for an analysis to be made which should be soon.” Did he ever follow up with you on that?
Anyway, I guess it's something I can live with as long as I can get the gun to work reliably, which is the next thing I need to work on.