Help Regarding Spots on Barrel and Mag Tube! in Benelli Posted Wednesday at 03:52 AM · Edited Wednesday at 04:21 AM by Four_Fifth 21 hours ago, bigoo7e said: Looks like it may be the starting of a little surface rust to me. I would check your other guns, especially any blued ones you may have in the same safe. If the guns have grips on them, take the grips off and inspect under the grips for good measure. Here in Louisiana we've got enough humidity to go around and then some. I've seen stainless guns get surface rust without the proper control of the humidity around here. As terms of cleaning it, I would try brass wool/brush or maybe nylon brush with your favorite cleaner, solvent or CLP first and if that doesn't work then you may have to move up to more abrasive stuff. I wouldn't want to go to hard on it though because it may compromised your guns finish. So I went and purchased rust remover. That wasn’t a good idea, lol. I tried it on a little piece and it turn it white! I used bluing and turned it back! Lol....Per a YouTube video, I purchased steel wool, 0000, and rubbed it with regular oil. That didn’t take away the spots either. Look also at the photos of inside the barrel. That’s probably not good.