When I first got my Hk SBE, I went through a bunch of diff aftermarket chokes in search of the best one. I tried Patternmaster, Briley, Carlson, CompNchoke, Kicks, and Wad Wizzard. Then, when I tried Terror chokes, the lights came on and I was in business. Unfortunately, Terror chokes are no longer being made and there are a few still avaiable right now, When current stock is gone, that will be it. My main Terror I use for the SBE is the .700 constriction and it stays screwed in my barrel the whole season. Glad I got mine and I dont want to use any other choke in my 12ga. I have three Terrors for my Benelli which are .675, .685 and .700. My son has a M1 Benelli and he has a .700 Terror for his.