If it is a new; recent production M2 then it will have the Crio Barrels. This means any of the Benelli Crio chokes will work. Most of the aftermarket choke companys offer EITHER the Crio Option or the dated "Mobile" option for the Benelli guns. Obviously you will want the Crio tubes for your new acquisition. As a footnote the barrels on your new gun ARE also chrome lined. As far as shell/choke combo for that weapon, other members will have to chime in with their successes/failures. In the meantime you can utilize the search feature on the board and concentrate in the "Guns" section, as well as the "Patterns" section to give you a starting point. Hope this helps some.