The BFSIII� for ACR is a 3-Position Trigger. In position 3 it will fire 1 round on Pull and 1 round on Release. This makes it the fastest semi-automatic trigger on the market. The BFSIII� is ideal for Tactical and Competition use. The BFSIII� provides greatly reduced split times between rounds and the ability to place two separate shots into a tighter group. - 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.