Heres an idea,
Id do what rmcl suggested, however, do not oil it, instead, put the barrel in some boiling water, this should convert that rust into black iron oxide (gun blue), rub with a paper towel vigorously afterwords. then put oil on it. or if you really want overkill, heat the barrel up with a blow torch being waved back and forth from a distance. do this only until the barrel is too hot to touch, and no more. then rub it with oil on and around the original rust area. have a 10 ga NEF and it did wonders, as long as the rust is minor
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