I have had good luck with first cleaning the rust with gun oil and/or clp and a tooth brush. Then I use an ultrasonic cleaner and the gun comes out absolutely clean and the rust is gone. If the rust created some pitting, you will see it. This does not impact the bluing. If you take this approach, make sure you lubricate the gun very well after cleaning since it will have NO oil on it after the ultrasonic cleaning. Good luck
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