Originally Posted by tom2

I have no idea why a rubber compound grip would cause any sort of rust unless palm sweat or something gets trapped under. Most of my Smiths are stainless so not really a problem. Maybe there is some kind of contamination of the grips such as mold release compounds etc. that is left from the factory. But if you got a blue gun, take off the grips once in awhile and clean and apply protection to the covered part of the frame.