I've a Glock Gen 3 model 23. I long since replaced the factory barrel. Shooting reloads and factory glock barrels are a bad combination to begin with. In addition, Glock doesn't recommend lead bullets in their barrels! The factory chambers are oversize so they will feed anything and everything thrown at them. This is good for a combat designed pistol. In addition, the cartridge head isn't fully supported. In a high pressure round like the 40, repeated working of the brass because of this and the sloppy chamber will eventually cause a blow-up.
Attachment 79025
Do yourselves a favor and pony up for a good fully supported barrel with a tight(er) chamber.
Attachment 79026