Are Binary Triggers Legal in Vermont?

Vermont's section 4022 defines a bump-fire stock as a butt stock designed to be attached to a semiautomatic firearm and intended to increase its rate of fire to that of a fully automatic firearm by using recoil energy to generate a reciprocating action that facilitates repeated activation of the trigger. Possession is punishable by up to one year in prison, a $1,000 fine, or both. That equipment-and-recoil definition does not describe an internal pull-and-release binary mechanism.

Binary triggers are legal under federal law and are not machine guns under 26 U.S.C. § 5845(b); ATF treats the trigger pull and the trigger release as two separate functions of the trigger, so one round is fired per function. Cargill v. Garland (2024) concerned bump stocks, not binary triggers, and does not change this.

Federal baseline verified 2026-10-20. Scope: Binary triggers (Franklin Armory BFSIII and similar): fire one round on trigger pull and one on release. Forced reset triggers are a separate class.