I carried a Glock in 9mm for some 15 years, then a .40 cal Glock my remaining 4 years on patrol. We qualified 2-4 times a year with our weapons, so they were used. I never saw that happen in any of our dept weapons, nor would I ever want to see that!!
A firearm is a mechanical, man made instrument and as such subject to failure. I had a S&W 4" revolver fail to "cycle" or just plain go bang. Turned out to be a "spur" (so the range officer said) on the cylinder and the gun would not fire.
Luckily, this was on a firing range and the weapon functioned fine after that.
That being said, I'm in the market for a .45. Was looking at Glock.....maybe I'll go with the new Remmy in .45!