Originally Posted by dhgeyer
Well, on closer examination of my extractor depressor plunger (henceforth called EDP) I discovered that JBS was right after all. What I thought was a ring is actually wear (scoring). The slide is digging into the front end of the EDP. And this is after only 500 rounds!
My Gen3 G27 that ejected erratically showed the same wear to the EDP. Every case of erratic ejection I've seen in which the EDP was examined, though few, showed the same wear. I wonder if the EDP channel may be too tight.
My suspicion at the time was that part of the EDP is slightly tapered and gets wider toward the muzzle end. In my G27 the gap between the extractor claw and breech face is noticeably bigger than in my G23, even when the extractors are swapped between the two. That suggests to me that the extractor indeed sits further forward in the slide, allowing the EDP to protrude slightly more from its channel with the slightly smaller diameter portion rubbing against the opening of that channel. There's a similar wear mark on the EDP of my G23 but it's ever so slightly further forward and it's no where near as pronounced.