I went to the range yesterday. It was a wonderful 28 degrees with a brisk wind. Son in laws friend was there with several guns to include a Glock 17. I noticed he was shooting hard cast lead through it and asked what barrel he was running. He said the stock Glock barrel. Mention lead build up in polygonal barrels and if he insisted on doing that to completely clean barrel every 100 rds. Shortly after that I lost track of him as I was enjoying my own guns. I heard a lot of yelling and cursing and looked down to see him holding his hands with the 17 on the ground at his feet. Needless to say the 17 scattered itself and he ended up being okay. Here are a couple pics.