The super vinci/vinci line will never replace the sbe II/m2 line for the simple fact that it will never have a slug barrel. There are many people out there who really need a slug barrel option to make the purchase, including myself. With the vinci design, there will probably never be a slug barrel. The receiver of a gun is considered the actual "gun". So, thats where the serial number goes. The super vinci/vinci line has the receiver connected to the barrel. So, they cant just sell a barrel/receiver piece for the super vinci/vinci with no serial number or someone could go out buy one, slap it on their vinci or super vinci and the gun would have no serial number. From what I've heard Benelli is trying to work around this issue, but not much progress is being made. I really hope they do get around this though because I really do think the super vinci will be a tremendous shotgun!