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