The tube for Plus-bore 20 gauge Rizzinis. Plus and standard Rizzini 20 gauge barrels are bored and threaded differently, so the profile has to match the barrel — the profile is stamped on the tube itself and listed on your gun’s spec card.
Flush tubes finish level with the muzzle and are available in all seven constrictions, including Light Modified — a half step between Improved Cylinder and Modified that a lot of sporting shooters end up leaving in the barrel all day. Extended tubes are knurled for hand changes between stands and are available in six constrictions.
Turned from bar stock, finished in black oxide, bench-checked against the barrel profile it is cut for, and rated for steel shot. Sold individually.