Wouldn't that be a lot like the AA12? It'd probably have a much slower rate of fire because the bolt has to travel much farther. If it was heavy and had a good compensator, it could be cool.
You can't get excited about something that can throw 9 .32 caliber balls out the barrel every time it goes bang. I don't know about you but I would rather have someone spraying at me with the guns you listed, instead of a full auto shotgun with a load of 00 and slugs.