Well they do. They break. But, it takes alot.
Yesterday when I was working at the range we got some parts and orders delivered. One of the things that came in was a new spring for the Glock 21 that we have in the rental case.
One of the guys who works their full time took the gun to the back and I asked if I could help since it was slow at that time. He said sure so off we went. The spring was the trigger spring. The one on the 21 we have needed to be replaced.
When he took the trigger assembly out the trigger pin came out in two pieces. It was broken cleanly in two right in the middle. So we had to order a new one and take the 21 out of service until it is in.
But, the point is, the gun had been working normally with a broken trigger pin for who knows how long.
We also have a Glock 23 that is getting sent back to Glock for repair because there is a crack in the slide. The crack is located between the barrel and guide rod holes in the end of the slide. It just cracked right between them. The gun still fires fine but they took it out of service just for liability reasons. It will go back to Glock Monday.
So, Glocks do break but in some cases, they still work broken. Makes me love mine all the more.