Tom, I will take a shot at answering your question. It looks like your gun is a 1916 20 gauge. First you have to locate a set of 20 gauge FW barrels, prefferably with complete forend(wood and iron). You can use either extractor or ejector barrels. Next you have to pray that they come close to fitting. Actually you may want to move prayer up to step one. These guns were hand fit and the parts are not usually interchangeable without some work. Once you have the barrels in hand you must take the parts to an experienced gunsmith who specializes in doubles. He should be able to quote a price to fit the barrels if they can be fit. From personal experience I can assure you that it won't be cheap. Finding 20 gauge FW barrels will likewise be a challenge. Keep a lookout on web sites that advertise guns and parts for sale, google search for gun shops that specialize in old doubles and contact them about barrels or look for and old junker with the right barrels. Another option is to have a new set of barrels made. This option would probably be the most expensive and the least fun. Good luck and if you choose to pursue this feel free to e mail me and I will help keep a lookout for barrels and share more of my limited experience with you. Peter