I would look for a project Flues feild grade gun. One with a broken stock would be perfect. Take the barrels from the new one and fit them to the one you have. Sometimes it is easier to find a set this way than wait until you find a perfect set of barrels just laying around. You should be able to find a good gun for a few hundred dollars which will be much cheaper in the long run than buying a series of barrels hoping to find a decent set. AuctionArms has been a good place for me to find guns like hte ones I describe.
