[Stras]

Personally I hate the Glock two piece trigger. Nice guns, but they do make a better after market trigger kit.

Have broken an extractor, but it was on my WWII Luger..... things tend to break when they are 56 yrs old....


Here's some others:
If you own a Berretta 92F. get extra trigger bar springs. you can use a paperclip in a pinch if you need to, but you'll need another spring for the example.

It's an easy to lose piece if you take off the pistol grips. I've only had one break on me at the range. hence the paperclip trick.. it worked, and I replaced it with a new one when we got back to the company area.

Walther PPK/PPKS... plastic handguards are easy to break. have a spare set.

1911s, TS already covered that.

If you perform routine maintenance and cleaning on your weapons, you shouldn't have a problem with parts malfunctions. dirty guns tend to break more often than clean ones.