Type: Assault rifle
Place of origin: United States
In service: 1963–present
Used by: * Afghanistan
* Australia (M16A1) (Replaced 1989 by Steyr AUG)
* Bangladesh: (Used by Bangladesh military, Special Forces and Counter Terrorism Units)[38]
* Barbados
* Belize
* Bolivia
* Brazil
* Brunei
* Cambodia
* Cameroon
* Canada: C7 variant is used by the Canadian Armed Forces.
* Chile
* Democratic Republic of the Congo
* Denmark
* Dominican Republic
* East Timor
* Ecuador
* El Salvador
* Estonia
* Eritrea
* Fiji
* Gabon
* Ghana
* Greece
* Grenada
* Guatemala
* Haiti
* India
* Indonesia
* Iraq: Iraqi army.
* Israel
* Jamaica
* Jordan
* South Korea: Manufactured under license by Daewoo.
* Lebanon
* Lesotho
* Liberia
* Lithuania: Lithuanian Armed Forces.
* Malaysia
* Mexico
* Morocco
* New Zealand (Replaced 1988 by Steyr AUG)
* Nepal[47]
* Netherlands: C7 variant is used by the Royal Netherlands Army.
* Nicaragua
* Nigeria
* Oman[
* Pakistan: Special Service Group (SSG) of the Pakistan Army.
* Panama (M16A1)
* Peru
* Philippines: Manufactured under license by Elisco Tool and Manufacturing.
* Qatar
* Senegal
* Singapore: Manufactured made under license by ST Kinetics.
* Somalia
* South Africa
* South Korea: Locally produced.
* Sri Lanka
* Thailand (M16A1/A2/A4)
* Tunisi
* Turkey (M16A1)
* Uganda
* United Arab Emirates
* United Kingdom: Special Air Service.
* United States
* Uruguay
* Vietnam (M16A1)

Wars: Vietnam War–present
Designer: Eugene Stoner, L. James Sullivan
Designed: 1957
Manufacturer: Colt Defense, FN Herstal, H & R Firearms, General Motors Hydramatic Division
Produced: 1960–present
Number built: 8 million
Variants: M16A1, M16A2, M16A4
Specifications (M16A2):
Weight: 7.8 lb (3.5 kg) (unloaded)
8.79 lb (4.0 kg) (loaded)
Length: 39.625 in (1,010 mm)
Barrel length: 20 in (508 mm)
Cartridge: 5.56x45mm NATO
Action: Gas-operated, rotating bolt
Rate of fire: 700–950 rounds/min, cyclic depending on model
Muzzle velocity: 3110 ft/s (948 m/s)
Effective range: 600 yd (550 m) point target
(800 m) area target
Feed system: Various STANAG magazines