Can you please give me information on an H & R 16 gauge shotgun serial number A113557? The gun reads Harrington & Richardson Arms Co. Worcester, Mass. U.S.A. PAT. FEB 23 & 27 1900 on the side of the receiver and 16 GA CHOKE on the top of the 30" single barrel. Was able to remove hinge pin (knocked out with brass punch and replaced after cleaning). Large frame (1-1/4" wide), round tang receiver. Is there any way for me to track model and production date from serial number. I need to purchase replacement stock and forearm Numerich is waiting on supply (out of stock) for models 1900, 1905, 1908 & 1915 but do not know when. Thank you for you time and information. Identify chamber size? Is the firing pin spring loaded? The firing pin on this gun slides free back and forth as though the spring is missing.