Which Of These Things Is Not Like The Other?

A large problem with activist groups is the resistance to information that's not part of the group's canon, coming from outside the group or that which casts doubt on its inerrancy. Maintenance of the group and its authority requires it and the integrity of the group often replaces the mission around which it formed. In the wider universe of people who would like to reform gun control laws in the interest of public safety there are sub-groups who push one reform over others, or one perceived kind of firearm over others and who often will brook no questions or challenges and will dismiss information or statistics or definitions by responding with hyperbolic accusations, maledictions and excommunications.

Suggest that a semi-automatic pistol can have the same firepower as a civilian version of a military assault rifle and you will be perceived and dismissed as a heretic, and no discussion of concealability will be permitted.  I say this from personal experience. Indeed one can carry two pistols with 30 round magazines and exceed the firepower of one bulky rifle.  Of course if you intend to shoot up a room, either weapon will do the same job, but you're either a handgun opponent of an "assault rifle" hater and so you can't cooperate and you won't learn and you can't discuss it. How many causes fail for lack of cooperation between similar or even identical interests?

I've worn myself out offering irrefutable evidence that that military looking thing you can buy at Walmart is not military and doesn't work like the military version, but if your group says it's a machine gun, they will go on arguing -- insisting that it is one no matter what. The important metric is not veracity, but the propagation of rage and fear, the success of the group and its leaders.

Gas or recoil operated machine guns for all practical intents are illegal for the general public.  Gatling guns are not.  Coming from the Civil War era, the Gatling gun, with its rotating barrels is a design still very much used by the military in airborne applications.  Unlike an autoloader or a double action revolver which goes bang for every trigger pull and unlike a true machine gun that keeps firing as long as you keep the trigger pulled, the rotary barrel Gatling gun fires thousands of rounds per minute.  It literally screams.  They are legal and yet the noise of people lying about "assault rifles" and their extra deadly "bullets" drowns out the muttering about motorized rotary barrel Megadeath machines.

There already is a two barreled, crank operated weapon available although I'veXM556 motorized, handheld Gatling gun is a nightmare. It can be chain fed, giving it almost limitless firepower and versions can put out something like 2000, to 4000 rounds per minute.  30 or more rounds IN ONE SECOND!  You're not going to be hearing about it and why? because the more fervent the anti-gun activist the less informed and the more resistant to learning anything. "We already know it all so go away"
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Yes, the XM556 needs an outside source of power, but hate finds a way. How soon before it finds a way to a venue near you?