I have a complete type 3 O\U barrel assembly for Perazzi MX guns. These MX8 barrels are 30" long with 8mm step rib. Recently refurbished by Giacomo. Which included side, and top rib re-soldering and re-blue. Bores are .740'' Bottom choke is .725'' and top choke is .715". Complete with matching iron and a nicely figured forearm. We were able to put this assembly on a DB81 as well as an MX15 and they fit quite well. Asking $3800 shipped to CONUS. Thanks for looking.