I had a couple long guns given to me by a friend whos father had passed away. The guns were propped up in the corner of a basement and I'm guessing alot of moisture in said basement. The gun I'm asking about is a New England Firearms Model SB2 Mag 10 gauge. The gun has considerable rust on the barrel with the worst part around the muzzle of the gun. Here are some pictures. Is this gun even salvageable? or should it get tossed? by the way this gun is very heavy weight-wise and barrel is pretty thick walled. Thoughts and advice wanted. Thanks everyone!