I've owned 6 Glocks over the years and I keep wondering when these "crap" parts are going to show themselves. When you treat a Glock like a 1911 and "believe" that you cannot get the best out of the gun without hampering it with tons of aftermarket parts, you are moving into dangerous territory.
Glocks work best right out of the box, All my Glocks are completely stock. The only problem I have ever had with any of them was a failure for the magazine to drop. And if you haven't guessed already, yes it was one of the non drop-free mags. That problem has been corrected.
An additional problem that presents itself, if anyone is planning to use a handgun for carry or self defense, shoveling on aftermarket parts, trigger jobs, ect ect ect... you are digging your own way to a jail cell.
Liberal DA's love to hear the words, modified, trigger job, custom. Give em less rope to hang you with, keep your gun as stock as possible.
P.S. if anyone has any "Crap" Glock parts, send them to me I'll give them a loving home.