I am in the same boat as devrep. Except for modern guns, generally O/U designs, I just don't see long barreled 20's. I have recently picked up two nice pre war J P Sauer 16's with 29.5" and 30" Krupp barrels that I am considering chamber sleeving (at least one of them) in order to have my long barreled 20 gauge. My interest is in the older guns, not modern designs.