Franklin Armory BFSIII CZ S1 Bring about Operation:Safe –Will not hearth.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 SelectorLaunch spherical can be canceled by simply transferring our Patented selector