Beretta firearms in 28ga can have one of the following 2 types of chokes: Beretta Mobil chokes just about 1 ½” long with threads at the top, Beretta Optima HP 28ga Choke about 2” long with threads starting about 3/8” from 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.