Franklin Armory BFSIII CZ S1 Trigger Operation:Safe –Will not likely hearth.Semi – Fires one round for each pull.Binary – Fires one round on pull and 1 spherical on release.* Ambidextrous Basic safety Selector.Will Fit most CZ Scorpion firearmsAmbidextrous Basic safety SelectorLaunch round can be canceled simply by going our Patented selector