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9mm vs. .40 longevity

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How much less is the lifespan of a modern .40 (not .45) pistol compared to a modern 9mm?

There's the Glock 17 in 9mm and the Glock 22 in .40, for example. S&W makes the M&P in both 9mm and .40 the last I checked. I think Sig makes both polymer and steel/aluminum pistols in .40. There was the CZ 75 in .40 but the don't make them anymore. I don't recall is Springfield makes their polymer guns in .40 anymore.
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The .40 is certainly more intense, but then again most .40 autos have a much heavier recoil spring and a few (as I recall) have a more massive slide. AS noted by more than one person above you would have to WORK at it to wear out a modern semi-auto by shooting it. I remember reading some years back about a Glock 17 that had a million rounds thru it with zero breakage. I don't know if they have done that with a .40 or not. The NYPD test for approval was 10,000 rounds.
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