I have an HK 9mm with less than 500 rounds through it. I clean it at the end of each shooting session. At the end of my last cleaning I noticed two spots in my barrel that wouldn't come off. I scrubbed and scrubbed with a bore brush and solvent and it didn't do anything. I soaked it in a vinegar peroxide solution and that did nothing. I used a plastic dental tool to try and feel is the spots are above or below the surface of the bore. It feels like they are below the surface but I am not sure. I have only shot Sellier and Bellot and Wincester ammo through it. I was reading over at glocktalk and some people have pitting in their barrels and some don't. I guess my question is: Is this normal and if it is not then would it get worse.
cyper
cyper