What exactly is a binary trigger? An aftermarket trigger for semi-automatic guns which allows a single spherical for being fired upon the trigger pull and one round being fired as the trigger springs again AKA binary shooting or double tap. The BFSIII B&T-C1 is explicitly made for the B&T APC9 https://binary-trigger-glock24456.azzablog.com/33082377/the-greatest-guide-to-are-binary-triggers-legal