Acording to the info from Benelli, my gun came with five flush-mounted Crio choke tubes (Cylinder, Improved Cylinder, Modified, Improved Modified, and Full). Only the more open chokes—specifically the Cylinder (C), Improved Cylinder (IC), and Modified (M)—are rated for steel shot.
All 5 choke tubes are in the following picture except the #4 which came inserted in the gun.
None of the chokes have any engraving on them, so once you remove the stickers your at the mercy of some pretty weak notching to identify which choke is which. I was contemplating buying aftermarket choke but this is where I have zero knowledge of what to replace them with.