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Use fine steel wool and gun oil or an all-in-one gun cleaner like G96 Gun Treatment.
Wet the rusted area with the oil / cleaner and softly polish it off witht he steel wool. Rust is soft don't need to rub too hard. If you do it right the finish won't be disturbed but the rust will be gone.
Make sure you wipe your guns down with oil before putting them in. Dont wipe it down then grab it with your sweaty hans to put it away, use a rag to handle it.