Wonder if it could be blood. Blood is very corrosive on metal.
Yes, it's the pin that's rusting.Is that even real rust? Look at the rear most pin on on the frame it looks like their is some brown on the plastic frame just outside of that pin.
wow, how is that even possible??
Fitting the barrel through the slide was like biting down on a fork and pulling it through your teeth. But as bad and nasty as it was, the action still felt solid and healthy. I'd kinda like to get it from him as a project. Been wanting an excuse to cerekote an M&P.