I have a 12 gauge Double Barrel shotgun. Serial Number: 110484. On the right barrel is printed: The Fulton. On the left barrel is printed: Hunter Arms Co Inc M'F'R'S Fulton,NY USA. Can you tell me when it was manufactured or anything about it? It works well but sometimes both barrels fire at the same time. A real shock if you are not expecting it. Thanks for your help. elmiller