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ELB wrote:I'm pulling this from another forum that pulled it form yet another forum that I can't find, so caveat emptor and all that, but:

Originally Posted by 26 USC 5845
(b) Machinegun
The term “machinegun” means any weapon which shoots, is designed to shoot, or can be readily restored to shoot, automatically more than one shot, without manual reloading, by a single function of the trigger. The term shall also include the frame or receiver of any such weapon, any part designed and intended solely and exclusively, or combination of parts designed and intended, for use in converting a weapon into a machinegun, and any combination of parts from which a machinegun can be assembled if such parts are in the possession or under the control of a person.


(c) Rifle
The term “rifle” means a weapon designed or redesigned, made or remade, and intended to be fired from the shoulder and designed or redesigned and made or remade to use the energy of the explosive in a fixed cartridge to fire only a single projectile through a rifled bore for each single pull of the trigger, and shall include any such weapon which may be readily restored to fire a fixed cartridge.

It looks like they saw the difference where "function" is used in section (b) for machineguns and "pull" is used in section (c) for rifles. Therefore, someone could take a virgin receiver, put a binary trigger in it, and then attach a stock and a short barrel. A machinegun is more than one bullet per trigger function. A rifle or SBR is one bullet per trigger pull. A binary trigger means the firearm shoots one bullet per trigger function but two bullets per trigger pull, so it's neither a machinegun nor rifle, just a "firearm." Since it was built off a virgin receiver then it doesn't meet the "remade" part of the SBR definition either.

Interesting.