You blue it.
Blue is a type of rust finish
Blue Book of Gun Values
Blue Book of Gun Values, gun shop, gun shows
Try Blue Book of Gun Values
Impossible to answer without more information, i.e., all markings, type of gun, finish, barrel length, caliber/gauge, box, papers, accessories. and it should say on the right side of the barrel.
Blue Book of Gun Values, old gun catalogs
Impossible to answer, not enough information. Who made it, what is the caliber/gauge, what is the barrel length, what is the finish, what are all the markings?
Yes. It has a white forearm and butt-stock with a blue barrel and receiver.
Blue Book of Gun Values
Oxidation of the steel of a gun barrel.
Blue Book of Gun Values