I have a Remington 870 and a Rem 700. Both are Blued. The other night I got the 870 out and noticed an odd tint to it. When I looked closer the whole reciver had a redish tint. I broke out the toothbrush and Hoppes #9 Well it was obviously a dusting of rust. When I ran some patches covered in Remoil over it this showed even more. It all came off without even marking the finish. I then looked at my 700 There were some pinhead sized spots of rust where the reciver mates to the barrel. there were maybe qa half dozen spots like this and an oiled cloth over the reciver showed a dusting just like had been on the 870. WHAT is going on. None of my other weapons have any rust that I have seen. None of my swords showed anything either and I figured some of them would have shown it before the Fifles due to the type of steel. None of my older Rifles show any markings either. They range from a Mod4Mk1 Enfield to a 2 month old AR. Why are only 2 of my Remingtons showing this problem.. THey are stored in a 6 gun gun cabinet that I keep closed. I have a Rem 597 that is showing no problems at all. HELP PLEASE.