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. *  Release round can be canceled by simply moving our Patented selector out of Binary® mode while holding the trigger back*  Easy to install *  Positive reset on release phase*  Works in most Stribog models A1, A3, A3S*  Great for competition shooters, tactical shooters, and recreational enthusiasts  Binary Firing System™ waiver and release Warning: Not for civilian sales in CA, CT, DC, DE, FL, HI, IA, IL, MA, MD, MN, NJ, NY, RI, and WA. NEVER ALTER ANY INTERNAL COMPONENT OF THE BFS™. Improper installation, use, or tampering with the BFS™ will void the warranty and MAY LEAD TO UNINTENTIONAL DISCHARGE OF THE FIREARM THAT MAY LEAD TO INJURY OR EVEN DEATH. No refunds will be issued for triggers after installation has been attempted.  By purchasing this product, you are accepting responsibility and liability for the serviceability of the final installation.  AFTER THE BFS™ HAS BEEN PROPERLY INSTALLED, IT IS IMPERATIVE THAT ALL USERS SEEK QUALIFIED TRAINING ON HOW TO USE THESE PRODUCTS.  May require a gunsmith to install.