The CZ Scorpion EVO 3 S1 is a short semi-automatic gun based upon the latest generation of the CZ submachine guns. The S1 version differs from the A1 model by being made of original parts that have been re-built to function as a semi-automatic only and its selector/ safety has only two positions: Safe and Fire – shooting in single shots. In all other aspects the S1 model retains superb properties in ergonomics and shooting performance of its service predecessor thus representing a perfect weapon for modern and dynamic disciplines in sport shooting.