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I possessed a 2nd gen Glock 22 .40 S&W for about 15 years that had ~ 35K rounds thru it over that time without one fail to feed, fire, extract or eject.
IMHO, no handgun is infallible, but that right there is a pretty darn good track record.
Saw a James Yeager video where they did a rapid fire test with a 19gen3 , it was only 700-800 rounds, IIRC , just remember that the guide rod melted, but the gun kept running , that was kind cool .