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.

Use

Many nations and weapons use the 5.56 mm NATO cartridge.

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Weapons using 5.56 mm ammunition include:

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• American M16A1/A2/A3/A4, M4/M4A1 Carbine, CAR-15, XM177E1/E2, M733, AR-15, and other rifles of the Armalite family
• American/Belgian M249 SAW / FN Minimi light machine gun
• Austrian Steyr AUG rifle
• Belgian FN FNC and FN F2000 rifles
• British L85 (SA80) rifle
• Canadian Diemaco C7/C8 rifles
• French FAMAS F1/G2 rifle
• German Heckler & Koch HK33, G36, HK23, and HK53 rifles and machine guns
• Indian INSAS assault rifle
• Israeli IMI Negev SAW, Galil assault rifle and Tavor TAR-21 bullpup assault rifle
• Italian Beretta AR 70/90 rifles
• Russian AK-101
• Singaporean SAR-21
• South African Vektor R4 and R5
• South Korean K2 rifle
• Can be used on the Swiss SIG 550 with lesser performances than the native Gw Pat.90 cartridge
• Remington Model 7615 Police Patrol Rifle