One of the problems with buying a choke is that there is no absolute guarantee that will be the "best" performer in your gun until you try it. Further there is usually a difference in performance using lead vs something like Hevishot.

I have a super 90 which is very similiar to the M1. I got very good results shooting lead with TruGlo's Strut Stopper.

There are plenty of good after market chokes that will turn your gun into a tight shooting turkey slayer. Kick's, Briley, Hastings, MAD, Rhino, Seminole, Lohman, and H.S.Strut to name a few.

Good Luck.