Parts breakage? None, but quite a few stamped parts way out of spec. Striker on a 23 has groves worn in sides of its "tooth" by the black plastic rear spring retainer, peeling coating on safety plungers, grooves worn in one end of the "Spring Loaded bearings" rod, etc. Teddy Jacobson mentioned once that the spring he finds that needs to be replaced the most often on Glocks is the trigger bar spring. He uses Wolff's for same.