M4 carbine

The M4 Carbine is a firearm tracing its lineage back to the 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, with 80% parts commonality with the M16A2. The M4A1 has selective fire options including semi-automatic and full-auto. It fires the 5.56x45mm NATO round, and is suitable for C.Q.C. Although the M4 has less effective range than the longer M16, many military analysts consider engagement with a non-specialized small arm above a range of 300 meters (330 yd) to be unnecessary. It is effective at ranges of 150 meters (160 yd) or less and has a maximum effective range of about 500 to 600 meters (550–660 yd).

Battlefield 2
The M4 Carbine is the standard primary weapon for the USMC's Special Forces kit. It has a Aimpoint M2 Sight attached to it, enabling an un-obstructed field of view when aiming. The M4 Carbine has reasonably high accuracy but with a low damage output. However, the lack of stopping power is balanced out by the weapons rate of fire. This makes the weapon very effective for many situations. When compared to its MEC counterpart, the AKS-74u, it has better accuracy and a better sight, but has a lack of stopping power. When compared to its PLA counterpart, the QBZ-97, it has identical stats for damage output and accuracy, but the M4 is considered superior because of its Aimpoint M2 Sight, while the QBZ-97 has only iron sights.

Battlefield 2: Modern Combat
In Battlefield 2: Modern Combats singleplayer, the M4 Carbine' is issued to NATO assault-class soldiers during Radio Silence. It has a moderate rate of fire, a 30 round magazine, high damage and good accuracy. It can kill in a single head shot and is effective as a sharpshooting weapon with its ACOG-like scope. It also has an M203 attached to it, though it is originally unusable. Blind firing for head shots and the grenade launcher can easily dispose of a large amount of enemies.

In multiplayer, it is issued to the USMC Assault kit and can be used similarly to how it's used in singleplayer.

Battlefield 3
It is presumed that in Battlefield 3, the M4 Carbine will make an appearance in the singleplayer campaign, as shown on occasions in both the Battlefield 3 gameplay trailer and a GameInformer article on the game. It has been seen most often with a 4X Rifle Scope and a tactical flashlight.