You might talk to Mark Beinke, at Sprague River, Oregon. 541-533-0909. He does liners for Springfield Trapdoors, and he might be able to do this work for you, too.
Years ago, now, a friend restored an L.C. Smith, breechloading, Damascus barrel shotgun by having Oscar Gaddy make new steel barrels for it. They cut off the damascus barrels in front of the chambers, then bored out the chambers to accept a " sleeve" cut on the ends of the two barrels. The barrels were then epoxied to the chamber block, and the only visible sign of the marriage is a very thin line where the orignal barrels were cut off.
There was enough metal at the back end of the orignal barrel to allow this to be done. It allowed Oscar to NOT HAVE to deal with welding a new pivot block to the barrels, and by using the original barrel chamber, he was able to keep the barrel regulation problems to a minimum.
I thought the gun was a bit muzzle heavy, but Charlie assured me that the original gun was just as muzzle heavy, and he didn't want to " improve " the gun so much as to have an heirloom that he could shoot, and his son could shoot when he is old enough. Apparently, the gun was used for shooting ducks and geese, and not upland game. Those muzzle heavy doubles were great for pass shooting, but not much fun to be lugging around corn fields, hunting pheasants. :nono: :rotf: :thumbsup:
