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If a bump stock is a MG, then so is a binary trigger, and this is a SBR by similar Trump-style interpretation of the law. .

montgomery wrote:Automatic is defined as one (unreleased) pull that fires more than one round. Release is not part of definition.

I don't know where you got that definition of automatic, but I used the 26 U.S.C. § 5845(b) definition of machine gun. I think the ATF does too.

TreyHouston wrote:So, what if it fired multiple bulets on the release of the trigger???

If it fires multiple rounds with one trigger action, it's a machine gun.

TreyHouston wrote:What about if it didn’t have a trigger but released many bullets on the computer recognizing a fingerprint?

A trigger doesn't have to be mechanical. A GE M134 is a machine gun according to the ATF.