I did not order any and do not plan to change from my current M2. Will has a Vinci that he uses for duck hunting. We were looking at how the barrel and stock come together and could not come up with a way to put a tube on a vinci since the barrel snaps into the stock. I am very interested to see how Nordic and others have changed the connection to allow use of a mag tube.
Regarding perceived recoil. All I can say is after using my O/U and going through an entire box of 3" black cloud ammo on opening day, I had no desire to hunt again the next morning with my over/under because my shoulder was sore. Will's shoulder was fine and he fired about the same number of shots. I doubt the recoil on the low brass bird shot we use for 3 gun is going to be that drastically different between an M2 and a Vinci. If we were shooting full power buck and slug all day, this would likely change my opinion.