The only thing I do to my Glocks, is install after market night sights
Yep. Had the cheap ass plastic rear sight fly off my first Glock 17 when I was dispatching a skunk here at the Ranch.
First thing I do when I buy a new Glock is put on new steel Night Sights. I prefer Heine Straight Eights.
Only other thing I do to them is put a 3.5 lb trigger disconnecter and a extended slide release.