#html-body [data-pb-style=UVJQQ4H]{justify-content:flex-start;display:flex;flex-direction:column;background-position:left top;background-size:cover;background-repeat:no-repeat;background-attachment:scroll}The Binary Firing System(R) GEN 3 (BFSIII(R)) 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 BFSIII(R) provides greatly reduced split times between rounds, allowing for tighter groups. Will fit most HK(R) 91, 93, & MP5(R) variants and clones Trigger pull weight about 4.5 pounds. Ambidextrous Safety Selector. Release round can be canceled by simply moving our Patented selector out of Binary(R) mode while holding the trigger back Safety Selector will fit in most two and three position trigger housings. Works in SP5K(R) housings. Trigger housing, ejector, ejector pin and ejector spring are not included. Some firearms may require additional fitting Easy to install Trigger Operation Position 1 - Safe -Will not fire. Position 2 - Semi - Fires 1 round per pull. Position 3 - Binary(R) - Fires 1 round on pull and 1 round on release.