I think that something like Evaporust will remove rust, bluing, patina and near any finish that is on the metal. If it is the product I think it is.
I guess it depends on what he wants to do with this gun. If refinishing the barrels completely is what is intended, then really any rust removal method will work since the metal will have to be re-struck to remove pitting in that area. However, if refinishing is not an option then mild methods of removing the heavier scale will need to be used (oil and mild abrasives), and the pitting can be lived with as part of the story of the gun.
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B. Dudley
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