As we have seen, the ATF, in ruling bump-fire stocks to be machineguns, explained that fingers are triggers, and it’s a machinegun if the finger isn’t moved volitionally. Some folks are confused, because they assumed that the volitional — and coordinated — movement of the off arm to cause the trigger firearm thingamajiggy to engage the finger trigger should count.
No prob. The PhDs in Anatomy and Physiology at the ATF have that covered: It’s only volitional when we say it is.
Thus, as explained in federal court to a science-challenged impaired… oh, hell… fucking idiot judge who bought it:
When you get down to it, it ain’t much more of a stretch than the shoestring machinegun.