I have an older Mossberg 500 pump that has seen some hard use and a lack of quality care when loaned out to a nephew, so I am using it for this test. I am going to try Marvel Air Tool Oil as a lube and rust inhibitor on this shotgun. It is a medium/light oil which is supposed to contain antioxidants and rust inhibitors. What do you guys think? I am expecting good or at least acceptable results, though I am anxious to get her out in some cold weather. I ususally use BC Sheath and will continue to do so on my other firearms.