M16 rifle
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The M16 rifle is a family of military rifles adapted from the ArmaLite AR-15 rifle for the United States military. The original M16 rifle was a 5.56×45mm automatic rifle with a 20-round magazine. Wikipedia
Designed: 1959
Bullet size: 5.56 mm caliber
Action: Gas-operated (Expansion of gas within piston inside bolt carrier), closed rotating bolt
Caliber: 5.56 mm (.223 in)
Cartridge: 5.56×45 mm NATO
Effective firing range: 550 m (601 yd) (point target); 800 m (875 yd) (area target)
In service: 1964–present