5.56 x 45 mm NATO

5.56 mm NATO, designated STANAG 4172, is the standard rifle ammunition for NATO forces. It is derived from, but not entirely interchangable with, the .223 Remington cartridge.

See also

• Caliber
• 7.62 mm caliber
• .50 BMG
• Gw Pat.90
• Table of pistol and rifle cartridges