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  1. Scratch in barrel exterior with rust, options?

    FN FS2000 Accessories & Mods
    I managed to get a FS2000 into California, but there's a minor scratch on the barrel exterior near the muzzle brake and it's already rusted. It's about as thick as a line from a fine tip pen, should I just clean and oil it or should I look into bluing pens or cerakote? Thanks everyone!
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