Franklin Armory BFSIII CZ S1 Set off Operation:Safe and sound –Will not fire.Semi – Fires one spherical per pull.Binary – Fires 1 spherical on pull and 1 spherical on launch.* Ambidextrous Security Selector.Will Fit most CZ Scorpion firearmsAmbidextrous Basic safety SelectorRelease round may be canceled simply by moving our Patented selector