I believe that those chokes fit mainly higher priced autoloaders for the most part. People, for the most part don't use them for turkey hunting,most people use pumps like the 835 and 870 for turkey hunting, which is why their chokes are popular. I have a Stoeger which takes the Mobil threads, and it really isn't an high priced gun, but I will say that the Mobil choke guns are not popular turkey hunting guns compared to the Mossberg and Remington.