hey, is your discolorization not rust colored, but more like a darker color grey or metal? Can you seem to not be able to get it off? I have discolorization in my cocking grooves too. I am not sure if its rust or just a result of the milling out of teh grooves (heat, chemical reaction from teh coolent they use on teh bits, whatever). Does anybody else know what I am talking about?
My Bi-tone slide has discolored!?
I went to a considerable amount of trouble and extra time as well as higher cost in obtaining a Bi-tone sub. Imagine my chagrin upon discovering that it has started to rust! I have kept it oiled as much as any of my other fireams and was not expecting this at all. If this finish is hard chrome, it has to be the thinnest application I have seen to discolor this way! It has spots in the cocking grooves as well as along side the front and rear sights. 
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