The FN PS90 is a semi-automatic rifle chambered in the 5.7x28mm cartridge, designed for precision and ease of use. Its 16.04" cold hammer-forged MIL-SPEC barrel is equipped with a ported muzzle brake, which effectively reduces recoil and enhances shooting stability. The rifle features a blowback operation system and fires from a closed bolt, contributing to its accuracy and reliability. The PS90 stands out with its fully ambidextrous design, including dual magazine latches, cocking handles, and an innovative synthetic thumbhole stock with a molded-in sling attachment point. The PS90 incorporates several user-friendly features, such as a bottom ejection port to prevent cases from interfering with the shooter, and an alloy upper receiver with barrel support. The stock design is a synthetic bullpup with a forward handstop and a molded-in rear sling attachment point for added versatility. Operating controls are optimized for ambidextrous use, including charging handles, a sliding trigger, an ambidextrous safety switch inside the trigger guard, an enlarged trigger guard, and a magazine release. The FN PS90 is available with either 10 or 30-round translucent polymer detachable magazines and includes a MIL-STD 1913 accessory rail with backup iron sights, ensuring adaptability for various shooting scenarios.