Franklin Armory BFSIII CZ S1 Cause Procedure:Safe –Will not likely fire.Semi – Fires 1 round for every pull.Binary – Fires one round on pull and 1 spherical on release.* Ambidextrous Security Selector.Will Fit most CZ Scorpion firearmsAmbidextrous Security SelectorRelease spherical is usually canceled by simply shifting our Patented selector