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It's not at all, I am not sure what kind of blueing they use, but it's worthless. I've worked on a few 870s that had a lot of surface rust from finger prints.

I left my 1187 in the trunk overnight once and it was a mess.

I bet, this is the worst one I have worked on. Nothing I could do for it, except blast it and seal it.
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luckily It was not that pitted!

When my buddy gave me that, I just looked at him a laughed.