M4 Carbine


 * For the related rifle, see M4A1

The M4 Carbine is a rifle found in Call of Duty: Modern Warfare: Mobilized and Call of Duty: Modern Warfare 3.

Call of Duty: Modern Warfare: Mobilized
It is almost a copy of the M16A4 found in Call of Duty 4: Modern Warfare. Notable differences are that the 3-round burst has a slower rate of fire, more compact iron sights, and a smaller delay between the bursts.

Singleplayer
In single player, the M4 Carbine is exclusive to the level "Closing In", though it can be seen in use by allies in all the missions of the American campaign. It produces the same sound as the M4A1, but it has a lower damage per bullet, still killing with one burst. Due to its 3-round burst and only extra 120 rounds that come with it, the M4 is the least ammunition efficient weapon.

Multiplayer
In multiplayer, the M4 Carbine is available by default, along with the MP5 and MP7. It is probably the least common weapon used in multiplayer, due to its lack of power, as it takes two bursts to kill, and low ammunition efficiency. Those who do use it usually discard it when the M4A1 is unlocked, since it has much higher power and the same rate of fire as the M4 Carbine, only without the delay between bursts.

Call of Duty: Modern Warfare 3
The M4 Carbine makes its first appearance in the main series, featuring a black finish. The gun can be seen with the dual sights and has a stock with a gap in the center.

Call of Duty: Modern Warfare 3

 * During the Reveal trailer, the M4 Carbine has both a holographic sight and a 3x magnifying sight attached at once.
 * The M4 Carbine that player holds during the reveal trailer appears to have magazine insertion sound identical to the G3 from Call of Duty 4: Modern Warfare, though this may be just temporary until the final sound for M4 Carbine is created.