I can't point you to the specific cite in the GCA/NFA laws, but it *IS* illegal to use a motorized crank. You've essentially created a device which will fire more than one shot with the activation of device... the unregistered "machinegun" could be something as simple as a small motor, or even the on/off switch to the motor!
That's why Gattling Guns are OK, but motorized Gattling Guns are called miniguns. <grin>
danbrew :->
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