I am a Glock armorer for my agency and oversee the maintenance and repair of about 150 Glocks. Around 100 of them are "well used" and we have regular breakages of several parts. The most important thing you can do is replace the recoil spring assembly every 2000 rounds. These are the parts I keep stocked for regular repairs (in order based on frequency of replacement)
Recoil spring assembly
Trigger Pin
Locking Block pin
Slide stop lever and spring
Trigger spring
Firing pin safety and spring
Other than the occasional freak incident those are the only parts I replace with any regularity.
I called Glock regarding some wear on the front side of my recoil spring assembly. They sent me one, and I have yet to replace it on my G35...and it's already been 3 years since.
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