Stevens 520 -30 Trench Gun , marked US on left side of receiver, flaming bomb proof marks on receiver and barrel, correct markings on barrel for trench gun, shotgun has smooth metal surfaces, a lot of the finish is left but has turned to a darker brown color, action works good, wood nice, has a crack in stock close to receiver ( see pic ) needs to be epoxied, has aluminum butt plate, and rear sling swivel. Barrel was turned at muzzle for choke, needs a sleeve installed for proper restoration, and needs bayonet lug and shroud.