Franklin Armory BFSIII CZ S1 Trigger Operation:Protected –Is not going to fireplace.Semi – Fires 1 spherical for each pull.Binary – Fires one round on pull and one round on launch.* Ambidextrous Basic safety Selector.Will Fit most CZ Scorpion firearmsAmbidextrous Safety SelectorLaunch round may be canceled by just going our Patented selector