I can't recall the name of the guy in Trinidad, CO that has built a pretty good number of 4 bores, but I believe that he's also built some 2 bores as well. Does very nice work, both metal and stock and is in the American Gunsmith's Guild. If you contact Chuck Grace (who is also in the Guild) and he could tell you. He's in Trinidad, CO as well and is in the phone book. I'll try and find his number when I get home.

Robert