First time I ever have one of my glocks (Gen4: 2 G20's and 2 G40's) hiccup on me. And I consider this a major hiccup had it happened when I was hiking in bear country or facing any other threat. Although I would not be using the cheap rounds then either.
I was at the range today, onto my second magazine loaded with Sellier Bellot when G20 seemed to have stove piped. Pulled and pushed on slide with gentle force only to see the extractor fall out and plunger pin sliding out from front. Field stripped the G20 and empty round was stuck in barrel. I had to grab the stuck case with the broken extractor part and with force to get it out.
My diagnosis points me to 3 issues:
1. The Sellier Bellot round that jammed was a bit out of spec or at end of spec range to the up side. As it was very difficult to pull out of barrel.
2. Barrel which is a Storm Lake (Please read below before you comment on this one) and is little tighter then OEM barrel, and which had never jammed before with all sorts of rounds, seemed to be barely failing the plunk test now after no cleaning for about 450 rounds, but did pass the plunk test when it was cleaned before and after this incident.
3. Not cleaning the barrel more regularly. Gun been shot at range for 6 straight times at about 75 per outing without a single cleaning. There seem to have been considerable black powder build up in chamber. The 3 cases that I used for the plunk test all passed comfortably after the cleaning.
I know many will point to the barrel as the main culprit and that I should not be using non-OEm parts, however in reality it is only 1 of 3 culprits and probably the lesser one. Why Storm lake barrel? Reason i bought Storm lake at the time was because my G20 was mostly for woods protection and needed to use hard cast bullets. And long ago I was under the impression that hard casts FN "lead" bullets better not be used with OEM barrels.
Anyway I do keep at home spare parts for my G20/40 and just replaced the broken part. Heading back to the range tomorrow probably to give it a go with a clean barrel this time. And I am strongly considering switching back to OEM or KKM barrel (which I do have on 1 of my G40's).
I hope at the least I contributed something with this post. Please let me know your thoughts or if any suggestions. Or maybe you can see something more then the 3 points I mentioned above. For example could it have also been a defective extractor just waiting to break? .. Or did maybe my pulling and pushing on the extractor break it, although I only used what I consider to be very gentle force.
One thing I would like to know is what is the normal life span of an extractor? using OEM barrel and all. And are there any suggested high quality after market extractors you recommend?
You had a MIM part fail. Yours won't be the last. If they're good, they're good. If they're gonna go, they do it in the first couple thousand rounds. I'm not sure I'd be focused on the barrel.
I've replaced the MIM extractor and firing pin with milled in my serious Glocks. Sorry, I don't know of a source in 10mm.