ACR

The ACR is an Assault Rifle in Call of Duty: Modern Warfare 2.

Singleplayer
The ACR is the main assault rifle for the Task Force 141 and is the starting weapon for most of the TF141 missions. It is first available to the player as an optional weapon in The Pit in the mission S.S.D.D.. It is also used in the mission "Cliffhanger", with a Red Dot Sight, Silencer, Heartbeat Sensor, and a unique arctic camouflage, however this may just be ice and snow. An ACR Grenadier version with ACOG Scope and Grenade Launcher is used in "Takedown", while another version featuring Holographic Sight and Grenade Launcher is used in "Loose Ends". A version with a unique matte black finish and the same attachments as found in "Cliffhanger" can also be found in the mission "Just Like Old Times".

Multiplayer
In multiplayer, the ACR is unlocked at Level 48. The ACR is similar to the M4A1 but sacrifices rate of fire for higher accuracy and has virtually no recoil. It carries 30 rounds in its magazine, deals 30-20 damage per shot, and has a fire rate of 750 RPM. The ACR, although it bounces when firing, has zero recoil as it resets perfectly before the next shot, which makes it ideal for medium and long range combat. Its moderately low damage per second makes it somewhat weak in close quarters combat compared to other automatic weapons, making it a good candidate for use with the Masterkey Shotgun.

Tactics
As a versatile weapon, most Perks and Attachments work well with the ACR, especially Stopping Power which allows it to fill a variety of roles. With Stopping power, it takes 4 shots to kill at long range (verses 5 without stopping power) and 3 shots at close range. The ACR is primarily used at long ranges and excels in medium-large sized and large maps with long lines of sight such as Wasteland, Afghan, Highrise, Derail, Estate, Bailout, and Fuel. The ACR consumes ammo fairly quickly, but its almost complete lack of recoil means that wasting ammo due to missed shots is usually not an issue. Because of this, thermal scope is good choice. Also, the ACR is one of the most effective weapons in the game for reload canceling; the player doesn't even need to wait until the magazine is fully inserted into the rifle before ammo is replenished.

In terms of damage output per second, the ACR's moderately low damage and moderate rate of fire make it one of the weakest weapons in the game, with almost every other gun outperforming it, in close quarters especially. However, it more than makes up for this at range, where its non-existent recoil ensures all shots go on target, which effectively makes it kill quicker than guns where burst-firing is necessary. Because of these features, it is one of the most, if not the most, used assault rifles in the game.

Weapon Attachments

 * Grenade Launcher
 * Red Dot Sight
 * Silencer
 * ACOG Scope
 * FMJ
 * Shotgun
 * Holographic Sight
 * Heartbeat Sensor
 * Thermal Scope
 * Extended Mags

Trivia
When the player reloads the ACR the magazine just disappears before the new magazine is inserted into it.
 * On Infinity Ward's website, the ACR was voted the favorite assault rifle in Modern Warfare 2.
 * The serial number of the ACR in Modern Warfare 2 (0091436. 91436) is the ZIP code for Encino, CA, where Infinity Ward is located.
 * When this weapon has a thermal scope attached, the pickup text will read "ACR Thermal Sight" instead of "ACR Thermal Scope".
 * The ACR appears larger than any other assault rifle when seen from 3rd Person.
 * The ACR, along with the M4A1, has the largest ammo capacity of any assault rifle (630).
 * The ACR seems to be the favorite weapons of Task Force 141 operatives Ghost and Roach.
 * A special ACR is available with three attachments and max ammo of 1260 rounds. They are located in "Cliffhanger" and "Just Like Old Times". These ACRs are equipped with Silencers, Heartbeat Sensors and Red Dot Sights.
 * Modern Warfare 2 is the first Call of Duty game to feature the ACR.
 * The ACR is the only weapon that can have the Heartbeat Sensor folded back manually (Campaign only).
 * In Create-A-Class, the ACR can be seen in a black finish, but if no camo is added, it is white on its camouflageable parts (see the gallery above). However, in "Just Like Old Times", one can find black ACRs in the steam room.
 * When slung on the back in third person, the ACR will appear with its attachments but no camouflage if the first person view has it. But if in third person and the player is holding it, it has camouflage.
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 * Acr Akimbo is possibile due to hacking.
 * It has 1023 rounds.
 * Acr can have Akimbo, red dot sight , and silencer due to hacking.
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 * Acr can have Akimbo, red dot sight , and silencer due to hacking.
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 * Acr can have Akimbo, red dot sight , and silencer due to hacking.
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Video
thumb|left|400px|ACR gameplay