Early Ruger single actions commonly had that happen to the loading gate and the problem has been discussed for years. The commonly held cause was that the steel used in the investment cast process used for the loading gates was of a different alloy than the rest of the gun, causing the bluing process to not work as well on them. I had one of those early guns and the loading gate was a purple color as I remember. I do not know if the current Rugers still have this problem or not.
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