I have a westernfield model 25 xnh-472 / Noble model 50 12 gauge shotgun that is in need of a complete firing pin assembly (pin, bushing, and return spring). Numrich is, of coarse, out of the part- typical of my luck. So the question I ask of you, my fellow lovers of obsolete crap that has seen better days, is where (without typing "gunshow") would a guy look to find a replacement?