I think Photman said it well. Lead bullets can cause problems with the polygonal rifling. Will it blow the Glocks up every time? NO! You can probably get away with it for quite a while and if you clean the barrel between every hundred or so rounds of lead bullets, you could shoot indefinitely without a kaboom.
So there are basically three choices with the Glock:
1. Don't shoot lead bullets
2. Shoot lead bullets and clean barrel VERY OFTEN
3. Buy a Bar-Sto or other quality aftermarket barrel
I like to shoot reactive targets so the Bar-Sto barrel option is what I'd recommend. Also these barrels shoot VERY accurately.
I think even with the additional barrel, the Glock will cost less than the 1911.
Regards! DaMan
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