A friend of mine is a DLEO with the SCDNR. They traded in their Glock 22s a few years ago and were issued new ones. They were offered the option to purchase the trade-ins for $450. Neither of us thought that was much of a deal so he passed on it.
To a much greater extent than most mechanical devices, firearms are terribly unforgiving of any overconfidence, complacency or negligence.