MG4

The MG4 is a light machine gun featured in Call of Duty: Modern Warfare 2 and Call of Duty: Modern Warfare: Mobilized.

Singleplayer
The MG4 is a very rare weapon that only appears in the Task Force 141 campaign. It is only seen being used once by Shadow Company in Just Like Old Times, but can be found and used in The Only Easy Day... Was Yesterday, The Gulag and Contingency. It has a much lower rate of fire than its multiplayer counterpart and can only hold a maximum of 200 rounds spare. For these reasons, other weapons are usually better alternatives. It never appears with any attachments.

Multiplayer
The MG4 is unlocked at level 16, making it the third LMG available to players. It has medium power and a moderate rate of fire, with extremely low recoil and very little idle sway with most attachments. It also has the lowest damage per minute out of the light machine guns, iron sights which are slightly faulty (patched in update 1.11) and suffers from the silencer glitch. For these reasons, it is the least used light machine gun in Modern Warfare 2.

The MG4 can be a very effective weapon. It is effective full auto even without the Grip. Without a grip, it is about as accurate as the M4A1. Likewise, when used with a Grip, it is essentially an LMG version of the ACR, with no damage loss over range, larger magazines, a slightly higher rate of fire, and the slower handling of an LMG (lower movement speed and longer time to aim down the sights). Even with the ACOG, this weapon can be fired full auto with minimal loss of accuracy, though the shooter must follow the target while holding down the trigger. These qualities make the MG4 a below-average weapon at short range and average at medium range as it will be overpowered by any other weapon with higher damage per second. It excels at longer range battles, where accuracy regularly trumps power.

The MG4 can be quite a valuable weapon at long range. Since LMGs have no damage drop off with range, the MG4 will kill in as many bullets as one of the higher damage assault rifles (the SCAR-H or the TAR-21 for example, if they all have or all don't have stopping power) but it has barely any recoil with a grip, and has a higher rate of fire than both of those weapons. Conversely, because of the lack of damage drop off or increase, using a silencer - with or without Stopping Power at close range is extremely ill-advised, as it still takes either 4 or 5 shots to kill, meaning much like the M240, the player will be overwhelmed by all the SMGs, most Assault Rifles, or even other LMGS. Since it has almost as little recoil as the ACR, it actually can be much more useful at long range because of its higher damage at longer ranges and it's slightly quicker rate of fire, along with the 100 round pouch. However, the slow movement and slower time to bring up the sights can be a deal breaker for many, making the MG4 one of the hidden gems of the LMGs.

Unfortunately, the MG4's iron sights are slightly off, as the rear sight is lowered compared to front sight. Bullets will land at the top of the thicker part of the sight (patched in 1.11). This problem is easily solved through the use of any optic besides the iron sights. Most players consider Bling with Grip and a Red Dot Sight, Holographic Sight, or ACOG. The Thermal Scope can be surprisingly effective on certain maps such as Underpass, Estate, or Wasteland as the recoil is mostly visual and resets quite quickly before the next shot. A Silencer is ill-advised on the MG4 since it decreases the damage from 30 to 20, meaning without stopping power it will take 5 shots to kill at any distance (4 with stopping power), as well as still showing up on enemy radar when fired due to a bug (also patched in 1.11).

Many players may be bothered by its slow reload (as it is tied with the RPD as the slowest in the game), but there are a few options to mitigate it. Sleight of Hand is one of the obvious perks to counteract the slow reload, also the benefit from Sleight of Hand Pro then makes the MG4 shine because the sighting time is decreased. One Man Army is actually faster than reloading the MG4 with the added benefit of replenishing ammo and equipment. Using the Extended Mags attachment for the weapon is another solution; giving the MG4 all 200 rounds in one large magazine and thus no reload (unless more ammunition is picked up).

It is to be noted that there is another glitch with the MG4. When FMJ is equipped with the weapon, the title for the weapon reads "MG4 Explosive Rounds". This does not grant the weapon any extra damage, nor does it grant it any splash damage, FMJ with the MG4 is like FMJ on any other weapon, the title is just written wrongly

While playing Split-Screen multiplayer (Local Multiplayer), the player cannot see the Heartbeat Sensor on the gun. This also applies when the player is aiming down the sight.

Weapon Attachments

 * Grip
 * Red Dot Sight
 * Silencer
 * ACOG Scope
 * FMJ (Called Explosive Rounds during gameplay)
 * Holographic Sight
 * Heartbeat Sensor
 * Thermal Scope
 * Extended Mags

Call of Duty: Modern Warfare: Mobilized
The MG4 appears in Modern Warfare: Mobilized as one of the two LMGs in-game. The MG4 shares the same basic appearance as its Modern Warfare 2 counterpart, but the ammunition is stored in a box as opposed to a cloth bag. The MG4 has a higher rate of fire, as well as a higher damage per bullet. The MG4 is only used by the Insurgency in the levels Interception, Needle in a Haystack, To the Rig, Winter Assault, and Last Chance.

Trivia

 * When a sight attachment is being used with the MG4, the reload is slightly different than an MG4 without the sight.
 * The MG4 in Call of Duty: Modern Warfare 2 is the first machine gun in the Call of Duty series that uses a cloth ammo pouch, the second being the M60 from Call of Duty: Black Ops.
 * The pickup icon for the MG4 shows it mounted with its default carrying handle.
 * The MG4 has the same third-person firing sound as the M60E4 but much faster then in Call of Duty 4: Modern Warfare.
 * An MG4 ammo pouch is seen in the weapon cache in S.S.D.D., despite this weapon is not available in this mission, or even any of the Ranger missions.
 * The MG4 without camouflage has dirt built up on top of it.
 * When the MG4 is reloaded, the charging handle isn't moved at all.
 * The MG4 can be considered to be the Call of Duty: Modern Warfare 2 equivalent of the M249 SAW, due to the similar damage and accuracy.
 * In single player, an MG4 with Arctic camouflage has its iron sights zoomed in nearly twice that of a MG4 without camouflage. This "bug" is not in Multiplayer.
 * The pick up icon for the MG4 has a built in Red Dot Sight, but not at any other point in-game

MG4