If you reload for the Glock and use the factory barrel, this is what your brass can look like if you are running the risk of a KB, or have experienced a KB.
I stick to a few simple rules for Glocks:
If using the factory barrel, shoot only NEW FACTORY AMMUNITION by a reputible manufacturer.
NEVER shoot lead in a Glock factory barrel.
If you must shoot reloads or lead, buy an aftermarket barrel. I personally use Bar-sto (
www.barsto.com ), but I've heard good things about KKM.
I reccomend this as a Certified Glock Armorer.