Hey Guys, I own several Glocks, this Kahr PM9 is my first. First thing I noticed was some powder residue like mark on the 9x19 marking of the barrel. I asked the dealer what it was, he said powder residue. (Fired 2x for shell casings) before I received it. He said some solvent would clean it right up. Well, I just attempted to remove the marking with solvent, no luck. The rest of the barrel is fine and clean. Is this normal? All the Kahr's I've seen look clean and sharp. Any recommendations? Thanks in advance!