recently bought an as new H&R handi rifle, upon further inspection found 1/2 dozen small areas on the external barrel with pitted rust, each no bigger than 2-3mm. After a search I soaked the areas in oil, dried and rubbed with 00 steel wool, after I tried a brass brush. I can still feel and see the rust. If I take care of this barrel will the rust spread? how much of an issue with this be? Thanks.
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