It depends. When we finally pulled our Gen 2 Glock 22's a few years back, they were well worn. They were around 18yrs old or something like that with and average of 400rds a year on them. Most had between 7-10k rounds through them when they were traded. Still serviceable but they needed TLC. Marion Co SWAT traded their USP .40 back in 2005ish. Those had so many rounds through them that they were loosing accuracy. Then some departments shoot little. It just depends.