Franklin Armory BFSIII CZ S1 Bring about Operation:Harmless –Will not likely fireplace.Semi – Fires 1 spherical for every pull.Binary – Fires 1 spherical on pull and 1 round on release.* Ambidextrous Basic safety Selector.Will Fit most CZ Scorpion firearmsAmbidextrous Security SelectorRelease spherical can be canceled by simply going our Pate