I have a double-barrel side-by-side 20-gauge. On the top of ...

I have a double-barrel side-by-side 20-gauge. On the top of the left barrel it is marked, "Jana." On the lower side it is marked "Made in Belgium." The serial number is 16114. On the underside, each barrel is marked with a figure shaped like an urn except the top of the "urn" appears to be a crown. On the inside of the urn shape is the letter "E" and under that letter are the letters "LG". My problem is, the left barrel misfires often. This problem developed during my ownership of the gun. I presume the firing pin has worn down. The pin is part of a fairly complex component that would require some skilled machining to reproduce. Is there a suppler that could provide me with that part? It is a beautiful gun, precisely balanced and I enjoy using it more than any other shotgun.