[Forgive me if this is posted in the wrong area.]
My novice friend just recieved his new Glock 19 a couple of days ago. We went to the range and put about 400-500 rounds through it, some of it quite dirty ammo. When we got back to his place, I had went outside to take a call and he started dissassembling it for cleaning. I just got back from the call when I noticed he was trying to run the factory supplied brush from glock through the barrel, dry nonetheless !. He had only run it through about twice before I caught him, and then per my instruction proceeded to lube the barrell and brush before inserting it.
Now he his worried about scratches in the bore. Does anybody know if 1-2 times with the factory brush will scratch the glock barrel?