Can get pretty bad!
Couldn’t get any worse than the back end of a shell blowing half off, right?
I guess it go blow fully off. But that wouldn’t hurt a big, tough, AR-15, right?
I checked Bing images, just to be sure, and no, the extractor isn’t actually supposed to be bent back like that.
Funny story about that PMAG. The sales girl told me that some of her customers had driven a truck over one and reported that it wasn’t damaged.
I’m not exactly sure what went wrong here. I originally thought that a round had gone tragically wrong and had lodged itself in the chamber so tightly that it had to be knocked out with a cleaning rod from the muzzle end. But when several subsequent rounds from different manufacturers also had to be banged out, I eventually took a harder look at the extractor. And, of course, that magazine, which seemed to have been damaged on the second or third round after the initial problem.
Obviously, the extractor needs replacing, but the shells also seem to be sticking in the chamber, although it’s difficult to diagnose this problem independently of the extractor.