The Stoeger O/U uses the Winchester/Browning Invector style chokes. We make several turkey chokes to fit your gun.. It is hard to suggest a choke to you without knowing which ammo you plan to use. This is why we have so many options, as they pattern better with certain loads compared to others. I can tell you our most diverse turkey choke for your gun is item# 19892 which is a .660 turkey choke.