I believe it was a steel brush.. It came with a cleaning l bought. It was meant for 9mm barrel. It just somehow got stuck in there and I spent 5 minutes trying to pull it out I was worried i could have "damaged" the barrel.
But if all it could cause is scratches I'm not concerned at all, it's a Glock it's gona get some scratches lol. But just wanted to be sure I didn't "f up the barrel" where I could get a bullet jamming in the barrel.
Seems like a mere brush can't cause that my damage, glad to hear.
I was pretty sure a brush designed for a 9mm couldn't hurt it much anyways, but I LOVE LOVE my Glocks so I'm OCD about them as you can tell