Originally Posted by Kaybe
....... From the pics, it looks like the ejector was just a bit too short and the brass was getting dinged on the slide, rear of the ejection port, on the way out. Since it was that close to the slide, it would come back and hit you in the face and head. Without seeing the gun, that is just my theory. Some people on Glocktalk.com had the same problem. They took the extractors out, polished the top and bottom of the piece and put it back in. Most say that this worked.
Bingo! I think you got it or, at least, most of it. Extensive analysis of this problem by a number of senior Glock Talk members indicates that: (1) The most recent molded extractors are slightly oversized; and this causes problems with, both, the horizontal and vertical dimensions. (2) The former molded extractor claws are straight when, in fact, they should have a vertical angle to them. (3) The older molded extractor claws do not grab case rims tightly enough; and, consequently, tend to, 'bounce' extracted cases out of the chamber. (4) The inside shoulder of these molded extractors, next to the round, 'pivot post', is too large; and this prevents the extractor claw from grabbing case rims deeply enough.
Glock, GmbH appears to be presently aware of these design flaws; and the necessary improvements are starting to show up in the most recent versions of their new cast extractors; and, yes, polishing the horizontal, 'flats' does help. 'Why'? Because it tends to reduce the extractor's overall thickness and works to prevent binding.