Well, with all of my shooting spread out among various issued & personally owned handguns, it's not often I end up shooting an excessively high number of rounds through any particular one. Through many examples of a particular model, certainly, but not often through a specific example itself.
I can think of one 6906 through which I estimated I'd fired more than 45K rounds, though ... and it required some minor parts replacement along the way, if only in the way of preferred preventive maintenance (since I carried it everyday for duty
). The original extractor started to chip somewhere around 12K, so I replaced it when I discovered it during a cleaning session (although it had been a previously issued weapon before I received it, so who knows how many rounds were actually fired through the weapon before I received it).
A friend of mine (for whom I maintain his personally owned S&W and Colt weapons) recently brought me his .40 S&W chambered SW99 for a new ejector. That meant a new sear housing block. Not too bad, considering he'd exceeded 50K through that gun.
This is the same guy that I constantly have to remind to actually clean his perosnally owned and carried off-duty weapons after he shoots them. (Since he shoots so much. Often daily) I generally perform a detailed disassembly, inspection and cleaning on his weapons once or twice a year (we live more than a couple of hours apart from each other), and I have yet to have him bring them to me 'clean'.
Once, when I field stripped his SW99 .40 I discovered sawdust, complete with chips, inside his pistol.
He didn't understand why I gave him grief about it. He explained he'd spent several days working with a chainsaw and hadn't had the time to field strip and clean the gun.
He said he'd practiced with his pistol since then, and since it had functioned fine, and he was bringing me the gun to inspect (and clean) anyway, he didn't see any reason to clean it before he brought it to me ...
:banghead:
Since we've known each other for about 35 years, it's not like I don't realize he enjoys yanking my chain.