The Binary Firing System GEN 3 (BFSIII) is a 3-position trigger. In position 3, it fires one round on pull and one round on release. This trigger is ideal for having more fun than you thought was possible with your Ruger PC Charger and Ruger PC Carbine. TRIGGER OPERATION: Position 1 Safe Will not fire Position 2 Semi Fires 1 round per pull Position 3 Binary Fires 1 round on pull and 1 round on release Specifications for Franklin Armory BFSIII PC-C1 Binary Triggers: Manufacturer: Franklin Armory Color: Black Trigger Shape: Curved Gun Make: Ruger Gun Model: Ruger PC Carbine Condition: New Caliber: .355 Caliber Features of Franklin Armory BFSIII PC-C1 Binary Triggers Release round can be canceled by simply moving our Patent Pending selector out of Binary mode while holding the trigger back Works in most 9mm and .40 Cal Ruger PC Carbine trigger housings Great for competition shooters, tactical shooters, and recreational enthusiasts Gunsmith Installation Recommended Package Contents: Franklin Armory BFSIII PC-C1 Binary Triggers