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 M4A1 is a fully-automatic variant of the basic M4 Carbine intended for special operations use. 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.