GENERAL SPECIFICATION - Semi-auto only - Closed bolt blowback operation - BARREL - Hammer-forged chrome-lined - Ported muzzle brake - RECEIVER - Bottom ejection port - Blowback operated action - Alloy upper receiver and barrel support - STOCK - Synthetic thumbhole bullpup design - Forward handstop - Molded-in rear sling attachment point - OPERATING CONTROLS - Ambidextrous charging handles - Sliding trigger - Automatic safety switch inside trigger guard - Enlarged trigger guard - Ambidextrous magazine release - MAGAZINE - Translucent polymer body - SIGHT - MIL-STD 1913 accessory rail and back-up iron sight - FN PS90 Standard - Chambered in the 5.7x28mm cartridge the FN PS90 utilizes blowback operation and fires from a closed bolt for greater accuracy and reliability. The FN PS90's civilian legal 16.04 cold hammer-forged MIL-SPEC barrel is equipped with an integrated muzzle brake to reduce recoil. Dual magazine latches cocking handles and an innovative synthetic thumbhole stock with a molded-in sling attachment - point help make the FN PS90 fully ambidextrous. Models with 10- or 30-round polymer detachable magazines are available.