Are Binary Triggers Legal in Pennsylvania?

Pennsylvania's ATF compendium directs readers to 18 Pa.C.S. section 908 for prohibited offensive weapons and its exceptions. It does not identify a binary-trigger or trigger-activator provision, so the device question depends on whether the installed mechanism meets one of section 908's enumerated or defined weapon categories.

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.

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.