the Gw Pat 90 by the many Swiss citizens who shoot in competitions and for amusement has resulted in significant input on its usage. Over 1 billion cartridges had been produced . See also 6mm ARC 6mm Optimum 5 mm caliber Express (weaponry) Table of handgun and rifle cartridges List of 5.56×45mm NATO firearms List of rifle cartridges Comparable Cartridge 5.45×39mm 5.8×42mm References Further reading Stan Christ, "5.56mm NATO Alternatives", Special Weapons Magazine, Semi-Annual #50 2007, pp. 52–59. External links DIRECT FIRE AMMUNITION Handbook 2021, Project Manager Maneuver Ammunition Systems} Pistol and rifle cartridges Military cartridges NATO cartridges Weapons and ammunition introduced in 1980