In 2001, Ceska Zbrojovka introduced an all-modern, compact-minded submachine gun chambered for the 9x19mm Parabellum pistol cartridge through the "Scorpion EVO3" series. The type utilizes a basic blowback system of operation allowing for semi-, three-round burst and full-automatic fire modes. While critical components are made of robust metals, lightweight polymers have been used where possible to provide a lighter end-product. Controls are ambidextrous to accommodate all manner of users and the weapon allows for a high degree of customizability - the cocking handle can be switched to the other side of the receiver, the grip radius is adjustable and accessories can be added across several sections of rail, these found over the receiver proper and to the sides and under the forend. Standard iron sights are fitted over the receiver and forend to back up any optics being fitted.
The Scorpion EVO3 utilizes a short (196mm) barrel length for ultimate compactness (the barrel protruding only a short distance away from the forend shroud). There is a shoulder stock though it is hinged to fold over the side of the receiver and, as a further feature, it is completely removable to transform the Scorpion EVO3 into a single-handed machine pistol. Magazines are inserted into a well ahead of the trigger group in the usual way. Field-stripping has been given attention to for a pair of pins hold the trigger guard assembly in place. Removal of these pins and the assembly allows access to the internal action for replacement or maintenance. The Scorpion EVO3 weighs in at a handy 2.77 kilograms when loaded and sports an overall length of 670mm with the stock extended. This decreases to 410mm with the stock folded over.
The primary production form of the Scorpion EVO3 is the "A1". In practice, the series has proven highly accurate out to 250 yards. The action is also reliable as a full 30-round magazine can be emptied in just 1.5 seconds thanks to its listed 1,150 round-per-minute rate-of-fire. Muzzle velocity is 1,200 feet per second allowing for strong penetration values. Operators of the Scorpion EVO3 A1 include the Czech Republic police and military as well as Egyptian police forces.
The Scorpion EVO3 S1 is intended for civilian markets and features a semi-automatic fire-only action.