Go to the hardware store and buy some 0000 steel wool (four ought -- really fine strands). Wet the 0000 steel wool with good quality gun oil and lightly rub the rusty area with soft pressure. The strands of steel wool are harder than the rust but softer than the blued steel. Rub a little, wipe clean, look at your progress, rub a little more, wipe clean, look at your progress.
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