Franklin Armory BFSIII CZ S1 Set off Operation:Secure –Won't hearth.Semi – Fires 1 spherical per pull.Binary – Fires 1 spherical on pull and one round on launch.* Ambidextrous Basic safety Selector.Will Match most CZ Scorpion firearmsAmbidextrous Protection SelectorRelease spherical could be canceled simply by going our Patented selector away