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I have had failure of some 1911 parts in just a few thousand rounds. Two piece barrels, slide stops, and other bad parts.
That said I also have some I have used in competition for many years that have well over 100,000 rounds through them.
Not that amazing of a feat though, I have a Glock I can say the same thing about.
Properly maintained and fed they are simple machines and can last for many cycles. How many revolutions do you expect out of your engine? Lots of stuff going on in there, more parts to fail, etc.
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