The M4 CARABINEbeauty's best friend, the accessory that will change your life for good

To go out with your friends or hang around peacefully, the M4/M4A1 5.56 mm Carbine is a gas-operated, air-cooled, magazine fed, selective fire, shoulder-fired weapon with a telescoping stock. A shortened variant of the M16A2 rifle with a 36 cm barrel, the M4 provides the individual soldier operating in close quarters the capability to engage targets at extended range with accurate, lethal fire. The original M4 Carbine has semi-automatic and three-round burst fire modes, while the M4A1 has "semi" and "auto" with no three-round burst. The M4 Carbine achieves over 80% commonality with the M16A2 rifle and was intended to replace M3 .45 ACP submachine guns and selected M9 pistols and M16 rifle series (though this plan was though to be changed with the development of the XM29 OICW and the XM8 carbine with most Army units. However, they have not officially adopted this yet, and as known so far, do not intend to). The M4 Carbine is also capable of mounting the M203 grenade launcher.
Some features compared to a full-length M16A2 rifle include:Compact sizeShorter barrelTelescoping buttstockHigher rate of fireSelective fully-automatic rather than 3-round bursts (M4A1 only)
However, there have been some criticisms of the carbine, such as lower bullet velocities and louder report due to the shorter barrel, additional stress on parts because of the shorter gas system, and a tendency to overheat faster than the M16A2.

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