The CZ Scorpion EVO 3 S1 Pistol is a highly anticipated and versatile firearm introduced by CZ-USA in 2015. This blowback-operated, semi-automatic pistol is chambered in 9mm and features a short 7.72-inch barrel, making it compact and maneuverable. It is equipped with an 11-inch Picatinny rail for mounting optics and open sights, ensuring accuracy and flexibility in targeting. Notably, the pistol incorporates 1/2×28 threads hidden beneath the factory flash hider, allowing users to attach either 1/2×28 or 18×1 muzzle devices. The Scorpion EVO 3 S1 Pistol is praised for its simple, reliable design, including ambidextrous controls, a non-reciprocating charging handle that is swappable, and an adjustable reach to the trigger. It also features a QD sling swivel pocket integrated into the rear sling attachment point. The Scorpion’s customization options are extensive, with a range of accessories such as braces, grips, forends, magazines, safeties, mag releases, charging handles, and triggers available for the EVO 3 platform. Noteworthy is its affordability, making it an attractive option in its category. The latest production model has removed the 3/4-inch sling slot present in earlier variants. The CZ Scorpion EVO 3 S1 Pistol is classified as a pistol by the ATF, and any modification that converts it into a short-barreled rifle requires ATF registration and tax payment. This model has been discontinued in 2023.