I have to side with John S., Doubs and Johnny P., gun oil and #0000 steel wool will remove surface rust without damaging the original rust blue surface. Lots of us guys have been doing it for years (years of gun work experience). The only time I have found that method to remove a blued finish is if it was a cold blue. As stated by the aforementioned individuals care should be exercised to just rub lightly and in the direction of machining. A heavy hand with any method will degrade a finish.
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If it's made after 1918...it's a reproduction
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