Military Armament MAC 5K 9mm 5.8″ 30+1 with Binary Trigger

3 Position Selector

Position 1 (Safe): The firearm will not fire.

Position 2 (Semi-Automatic): Standard operation—fires one round per trigger pull (nothing fires on release).

Position 3 (Binary Mode): Pull: Fires one round when the trigger is pressed to the rear. Release: Fires a second round when the trigger is allowed to move forward.

Safety / Round-Cancellation Feature: If you press the trigger while in Binary mode but decide not to fire the second round on release, you can hold the trigger back, flip the selector switch back to Semi or Safe, and then safely release the trigger without discharging a round.