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. - Easy to install. No custom fitting. - Better trigger pull. 4.5 pounds +-.5 pound - The release phase now has a positive reset. - New design eliminates backup disconnector. - Stronger buffer spring (included) reduces the possibility of hammer follow. - Works in most AR application: AR10 (308 WIN) AR15 MPX etc. - Works in our F17 series in .17 WSM WITHOUT modification. - Works on .22LR uppers WITHOUT modification. - Works on 9mm uppers WITHOUT modification. - NO SALES TO THE STATES OF NEW YORK DELAWARE and NEW JERSEY