Being a relative gun noob, I made the mistake of forgetting to clean my shotgun prexmas and then it sat until last week, when I remembered and cleaned it ( See picture below). The barrel is an 18.5" tactical with threaded choke. There is a small amount of pitting that looks like scratches just outside the forcing cone. I have probably put three hundred rounds through this barrel of slugs, 00 buck and some other birdshot. Should I just polish and clean it like crazy, or should I be running off to a gunsmith? Will cleaning it immediately prevent this from getting worse, or happening again if I buy a new barrel? Thanks in advance.
