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I have shot a 9mm out of a 40 cal pistol, never in a 45. The CZ P01 and P06 use identical magazines with different followers. I grabbed the wrong magazines for the gun I picked out. The 9mm case fire formed to the 40 chamber. The pistol didn't cycle well.

At my first CHL class, a guy showed up with a brand new, never fired, never cleaned Jennings 9mm. The instructor took a couple minutes with him to oil it up and get it working.

Another renewal class, my ParaOrdnance P14 which had been nearly perfectly reliable decided to have a couple of failures to eject. Another guy next to me had bragged about his tuned up 1911 before the test and it had more malfunctions than mine did. I carry better guns now.