I don't know of any ONE numbered part that is more prone to failure. If there were it would probably be the extractor, but you see a lot of mis-numbered hold opens too. Of course the ejector spring is a crap shoot.
I'm probably one of the few who have actually broken an upper barrel extension. Broke that Baby right in half on an Artillery...
It would be nice if the list was short to make cautionary replacement simple, but IMHO it is not.
dju
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