Fact: The majority of our customers purchase our barrels to shoot commercial reloads or their own reloads using jacketed, hard coat or plated bullets. We do not hear anything but GOOD NEWS from these guys. Your average Glock shoots 4 to 6 inches at 25 yds. If you shoot 6" at 25 yds I guarantee you will reduce your group size by simply swapping to one of our barrels. FYI: During the mid 90's I was a sponsored shooter. I received free guns from Glock, free equipment from Safariland, free lead from A-Zone, free powder from Vihtavuori powder and Pro Load would load it all for FREE. Needless to say I had lots of trigger time and plenty of experts to draw conclusions from. After a single year (about 50K rds) it was the clear consensus of all mfgs, lead bullets should be avoided in Glock factory barrels. Yah, we set out to prove Glock Inc wrong regarding the use of lead bullets in their factory barrels. All we did was prove them right. Believe what you want.