Originally Posted by Taterhead
Secondly, extractor abuse. On about 1 out of 5, the case would slip out of the extractor upon primer strike, and was forward inside the chamber. What this tells me is that a live round could slip past the extractor during the engagement of the striker.
I could be wrong, but I'm not convinced this is what was happening for you. Maybe the force of the primer ignition was pushing the case forward past the extractor; this is much more likely that the striker itself pushing the case forward.
I have never experienced this with loaded ammo in the Glock. Not saying it can't happen, but empty primed cases don't tell the whole story.
Of course, maybe there's something wrong with your extractor. With a properly working extractor, a round should not be able to slip past it without ripping off part of the rim. Not going to happen from the striker impact.
Either way, if the round gets in front of the extractor in a Glock, it will not fire.