A cousin purchased a used Winchester 1300 SN L286XXXX slug gun with a anodized black finish and plastic stock. It is a smooth bore barrel with an Improved Cylinder screw in choke. The barrel lists 2 3/4" - 3". Would like to use for small game and would need a barrel, preferably 28" with screw in chokes. Any ideas on this choice and if barrels would be available used and if not preferred method to purchase a new barrel.