One thing that is cool it does away with the broom stick/ buffer aft of the reciever resulting in a much shorter package. Add a 5 inch barrel and a 100 round drum for maximum protection! CC it.
I believe there's still a long tail on the shortened BCG which travels aft and down into the grip (like some semi-auto shotguns). In pistol calibers a Glock long slide would do the same thing. For rifle calibers a piston AK micro would be a cheaper total cost too. Seems to be a partial workaround for commie gun control States.