The F2000 is a 5.56x45mm NATO bullpup rifle, designed by FN Herstal in Belgium. Gas-operated and fully automatic, the F2000 is a selective fire weapon operating from a closed bolt. Both safety system and trigger mechanism were adopted from the P90 personal defense weapon. Using a unique ejection system, the F2000 is a fully ambidextrous, bullpup rifle with the spent cartridge casings being ejected forward and to the right side of the weapon through a tube running above the barrel.