**Note: This cannot ship to the following states: California, Washington DC, Iowa, North Dakota, New York, New Jersey, and Washington** The revolutionary Binary Firing System will be appreciated by three gun competitors, tactical shooters, and recreational enthusiasts. It features a three position selector that allows the user to switch from Mode 1 for Safe, Mode 2 for traditional Semiautomatic Mode, or Mode 3 for Binary Mode. In Binary Mode, the firearm will discharge one round with every function of the trigger whether a pull or a release. A user can negate the round that would otherwise be fired during the release function by simply moving the selector back to Mode 2 and then safely releasing the trigger. Features: - Easy drop in installation. No custom fitting. - Better trigger pull. 4.5 pounds, +-.5 pound - The release phase now has a positive reset. - The design eliminates backup disconnector. - Stronger buffer spring (included) reduces the possibility of hammer follow. Specifications: - Works in every AR application: Ar10, AR15, MPX, etc. - Works in the F17 series in .17 WSM without modification - Works on .22LR uppers without modification - Works on 9mm uppers without modification.