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| Carbine, 5.56 mm, M4 | |
|---|---|
 An M4A1 with SOPMOD package, including Rail Interface System (RIS), flip-up rear sight and Trijicon ACOG 4x. | |
| Type | Assault carbine |
| Place of origin |  United States |
| Service history | |
| In service | 1994–present |
| Used by | See Users |
| Wars | War in Afghanistan (2001–present), War in Iraq (2003-present) |
| Production history | |
| Produced | 1994–present |
| Variants | M4A1, CQBR |
| Specifications | |
| Mass | 5.9 lb (2.7 kg) empty 6.9 lb (3.1 kg) w/ 30 rounds |
| Length | 33 in (838 mm) (stock extended) 29.8 in (757 mm) (stock retracted) |
| Barrel length | 14.5 in (368 mm) |
| Cartridge | 5.56x45mm NATO |
| Action | Gas-operated, rotating bolt |
| Rate of fire | 700–950 round/min cyclic |
| Muzzle velocity | 2,900 ft/s (884 m/s) |
| Feed system | Various STANAG Magazines. |
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The M4 Carbine is a family of firearms tracing its lineage back to earlier carbine versions of the M16, all based on the original AR-15 made by ArmaLite. It is a shorter and lighter version of the M16A2 assault rifle, achieving 80% parts commonality with the M16A2. The M4 has selective fire options including semi-automatic and three-round burst (like the M16A2), while the M4A1 has a "full auto" option in place of the three-round burst.