This is a skin for the Pump Shotgun item. You will be able to apply this skin when you craft the item in game.
The Pump Shotgun is a mid-tier, close ranged weapon. With a magazine size of 6 and relatively fast firing rate it is ideal for close quarters raiding and combat. Its effective range varies only slightly on the ammo that is being used, but can be increased by using Slugs instead of Buckshot or Hand Made Shells.