Benelli Firearms in 20ga can have one of the following 2 types of chokes Crio Plus just under 3” long with threads in the middle (most common in current production guns), Mobil Choke just over 2” long with threads at the top. Choose the type of choke your firearm uses from the list below. Each picture next to the scale represents a flush choke for each different type. Pay attention to where the threads are located on the body of your choke in relation to the pictures, as well as the size on the scale.