I have one of the new all american Glocks. I was told by the Glock reresentative when I spoke with him after my last replacement gun their was no new non-dipped extractor. Still insisted that it was an ejector problem. Got my new GEN4 G19 and it has a non-dip extractor.
So far it's been good for over 200 rounds. I'm still leary. Two other replacement GEN4 G19's were good for 800 and 2000 rounds before problems. I have the APEX extractor if I need it. But I'm going to stick with the stock one to see if it gives me any trouble. So far good ejection between 3:00-4:00 even with cheap 115gr. stuff.
Which being SAMMI SPEC it should work. Still likes the heavier hotter stuff better. But as I mentioned in other posts I've now seen two G17's at my local Academy Sports with non-dipped extractors. Both late model GEN's. All the others had the dipped extractor. Doesn't seem to be any rhyme or reason to it. But it's not a myth.