My usual reply to hard double gun questions: Ask over on the www.doublegunshop.com "Doublegun BBS" forum. If anyone knows, somebody over there will. Not an easy item to find, but there has to be one out there, or at least the metal parts. You could have somebody make the wood parts, or order them from some of the suppliers of shotgun wood. It's the forend iron and especially the ejectors that will be hard to get. Possible LC Smith ejectors might work?