Weight: 5.9 lbs (2.7 kg) empty
6.9 lbs (3.1 kg) with 30 rounds
Length: 33 in (838mm) with stock extended
29.8 in (257mm) with stock retracted
Barrel Length: 14.5 in (368mm)
Cartridge: 5.56x45mm NATO
Action: Gas operated, rotating bolt
Rate of Fire: 700-950 rounds/min
Muzzle Velocity: 2900 ft/sec (884 m/sec)
Effective Range: 550 yds (500 m)
Feed System: 30-round box magazine.
The M4 is the carbine version of the M16 assault rifle. It is especially favored by counter-terrorist and special forces units for close quarters combat because of its compactness and firepower. These features also make it useful for urban warfare. The M4 can be set to semi-automatic or three-round burst, while the M4A1 has the ability to go fully automatic.