The Binary Firing SystemA(R) (BFS(TM)) is a 3-position trigger. In position 3 it fires one round on pull and one round on release, making this trigger ideal for both tactical and competition use. The BFS provides greatly reduced split times between rounds, allowing for tighter groups. The BinaryA(R) AR-Elite trigger comes with premium features which includes interchangeable trigger bows. You may now choose whether you want a curved trigger or a straight flat-faced trigger! 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 Not for civilian sales in: CA, CT, DC, DE, FL, HI, IA, IL, MA, MD, MN, NJ, NY, RI, and WA