Bramble- Yes they are rifled barrels. 1:22 twist and probably 26 inches long. I am measuring everything today and then will get Pac-Nor to make them for me. They made my first 12Ga 2" diameter barrels. Thank you for the excellent explanation. One point of clarification, You mentioned that you bored out the chambers to get rid of the chrome plating. Didnt that boring remove any taper in the chamber? I was actually also thinking of a shoe lump approach. One question is,do you make the shoe lump with a built in angle of a few degrees for initial convergence or are the barrel channels parralel to each other? Finally do you use a furnace to "braze the whole thing together and if so what temp do you use? The reason I ask is i could CNC out a shoe lump pretty easily if I knew enough to do it right.-Rob