So, you walk into your local indoor shooting range and gun store, and there by the end of the counter are a huddle of shooters talking. As you walk past, you notice that it's the shop's gunsmith, a local IPSC shooter with her open-class racegun dangling on her hip, and a guy you vaguely recognize from the local police department. They're talking about some esoteric part for 1911's that's supposed to be super tough or something, and so you just can't resist tossing out "Well, I shoot a Glock, so I don't have to worry about stuff like that breaking." They look at you like you've just grown a third eye and ignore you as they resume their conversation.
Hmph. Buncha old fashioned stick-in-the-muds and their nostalgia guns, right?
Actually, you made yourself look like an idiot.
The gunsmith has to maintain the range's rental guns, as well as fix customer's guns. He's seen plenty of broken ones of every make and model, including Glocks.
The IPSC shooter doesn't really shoot her Open gun all that much, but she's been running 30,000+ rounds a year through her Production Glock for the last three years straight. She's been on the phone with Smyrna a few times.
The cop is the department armorer, in charge of making sure that all their issue Glock 22's stay up and running and have the latest generation of ejector or magazine follower or whatnot. He knows what breaks on Glocks.
None of these people think you're an idiot for liking Glocks; heck, they all shoot Glocks and recommend them and carry them. They think you're an idiot for assuming that a mechanical device composed of springs and levers is unbreakable.
There are two worlds of pistols: One is composed of the ridiculous "torture tests" you see advertised in magazines and bandied about on the internet. Composed of fans and brand loyalists who haunt forums and claim that their gun has shot... umm... well it's probably at least... er... fifty thousand rounds without a malfunction! Not even a dud primer!
The other is composed of the folks who have to read service bulletins put out by manufacturers. "The old trigger bar is being replaced by the new part, part number 123-1, identifiable by its -1 marking." Who keep log books on every gun and replace slide stop springs every X-thousand rounds whether they've broken yet or not because this isn't just a hobby for them.
Face it: If your gun hasn't broken something, you're not shooting it enough. Or you're incredibly lucky. But don't kid yourself that it won't happen. Springs and extractors are wear parts. That means they wear. Which means they break. Replace them on a schedule.
(PS: 10-8 has an excellent piece up on 1911 maintenance from a department armorer perspective. Links to similar on Glocks and SIGs and stuff would be nice to have.)