Glock Perfection is a lie for these reasons. My Colt will gobble up anything that the Glock gags on.
Respectfully, the marketing gimmick is just that.
"Sig Perfection" would be a lie
"Kimber Perfection" would be a lie
"Springfield Perfection" would be a lie
and so on, and so on, and so on...
Glocks don't react well to certain ammo'. If you are going to use a Glock...then don't use ammo' that has been reported to cause problems and expect good results.
Because of this "dietary sensitivity", some won't buy a Glock, and that's fine. I have 3-40's. I keep them clean, feed them nothing but factory ammo', and watch my cases for signs of issues.
I also have other platforms that I enjoy, some signficantly more than the Glock line. It's a tool, it performs within its design limitations and I set expectations based upon that. Overall, I've been pretty happy with mine, but if you want to shoot lead, reloads, or very cheap brass...maybe you should be looking at a different autoloader.
An aftermarket barrel can be a good investment if in all other respects, you like the Glock line. KKM, for instance, makes a barrel that several THR members have had good luck with. Drops right in, reliable, and you can expand your Glock's diet.
Safe shooting,
CZ52'