Used Perazzi 29.5” MX8 Trap/Bunker/Flyer/Helice barrels. Bore: 18.4 mm /.724” Bottom: .724” .695” = .029” Top : .724” .684” = .040” Parallel section in ea 1.00” + Weight : stamped 1.540 kg. Actual 1.525 kg. Date Code: BH (1996 build date) Rib: 11mm X 11mm with Tramline!! Front bead: factory white long Rear bead pressed at 17” and second one drilled at 9.5” 3-56 threaded. This is the only set of 11x11 barrels I have ran across with tramline down the center. 95% 2800.00 shipped to your door. Have complete Galeazzi engraved pigeon gun if you desire more than just barrels.