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 16.04a ^2 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.