This appears to be promising. we have had about three generations of work with light rapid fire automatic weapons which lay on the fire power but always give up accuracy. This often means a loss of reliability as well. The AK 47 stills works well enough in that environment even if it is seventy years old.
Something like this may well solve the reliability problem while throwing real weight down range.
My personal standard is still the military Lee - Enfield 303 which has only now been replaced by the Arctic Rangers. The delay was for reasons that i can completely appreciate. The new weapon had to be able to stop a charging polar bear. It is what I want if I were so unfortunate as to face a charging grizzly. Trained hands can lay down an aimed shot every second. A bear is traveling at thirty miles per hour and you are at less than one hundred yards. That means you have about three shots at best and you will not need to breathe.
Laying down four rounds from this device may have the same weight and rapid fire ability. Reports have suggested that anything less is likely fatal even if you pepper the bear with a large mag of smaller ammunition.