Hey Big JD: Make sure you rub some oil onto the outside of the barrel when you have the gun apart. I thought the barrel was coated with paint or something and it is not. I had the gun in its case travel in and out of the pickup, overnight in the cabin, at dads, and several other places exposing it to several temerature changes. Light rust coloring started on the oustside of the barrel due to some small condensation deposts caused by the temperature changes.