Does anyone know if Benelli's M4 barrel #81246 will work on a M1014, if not what are the differences. Is the difference in the 2 versus 4 ports or are there other differences that would prevent it from working, and can anyone confirm that the above number does come threaded for screw-in chokes. I have tried to talk to someone at Benelli about this but have been getting conflicting answers. Thanks in advance