Rust remover will remove both rust and bluing. It is a mild acid, so it can be removed with water, but remove it as soon as possible after you get the rust/blue off. I suggest detail stripping the pistol but not removing the sights. With all the parts out of it, the frame should be easy to clean up as much as it is going to clean, then you can polish as you want and put on the coating.
Just make sure you plug the barrel with wooden plugs so the blue remover and water don't get into the bore and possibly damage it (or damage it more) and of course to keep the Duracoat out. Make the plugs long enough so you can use them to handle the barrel/receiver while you are working on it.
Jim
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