Are Binary Triggers Legal in Missouri?

Missouri Revised Statutes section 571.020 governs possession, manufacture, transport, repair, and sale of enumerated weapons and supplies exceptions within the same section. ATF's Missouri compendium does not identify a separately named binary-trigger or rate-enhancement offense.

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 2026-07-31. 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.