However, I know for a fact that I put over 2500 rounds through my Glock 21 during my time at Cobb S.O. with training and personal shooting and never had any issue at all with it.
Oh, so you say you shoot handguns, do you now?
JK.
Then again, I used to put in the tens of thousands of rounds down range in any calendar year. I will say that 2500 rounds minimum mean rounds til failure is not hard to do for most reputable modern day firearms.