Do we have any gunsmiths out there that are familiar with this shotgun. I have one of the early ones made in Japan, that misfires on the top barrel. I have tried replacing the main spring which is a flat/V spring. To my knowledge there is only one manufacture that still supplies this type of spring and I think they are using a lighter spring than what the factory supplied. At first it would only misfire once or twice every box of shells, now its a constant misfire. Can anyone offer any help. The replacement spring was no help.
Bob