AA-12

The Military Police Systems AA-12 (Atchisson Auto Assault-12) is a select fire shotgun considered to be the first shotgun directly designed for military and law enforcement use. It fires at 350 RPM (400 RPM ingame), and accepts an 8 round detachable box magazine, or a 20 or 32 round drum. Its biggest rival is the versatile, and extremely popular Russian Saiga 12KS-K select fire shotgun. The AA-12 is unlocked at level 18 in Modern Warfare 2's Multiplayer.

Multiplayer
The AA-12 is a unique shotgun, as it is fully automatic and utilizes a magazine. It has an 8-shell magazine capacity, which is doubled when the Extended Magazines attachment is used, which balances the weapon's power and speed, but may have a reserve of 70 extra shells. The AA-12 empties its magazine far more quickly (400 RPM in multiplayer) than it reloads as the magazine needs to fit onto the magazine support, and then slide up into the magazine well, though this is slightly offset when the Sleight of Hand Perk is utilized. Since it uses magazines rather than individual shells, it is the fastest empty loading shotgun in the game.

In multiplayer, the AA-12 has only one extra magazine, so it is advised to use it sparingly, unless Scavenger is used. It has moderate recoil unless firing full-auto, and very poor range, even when compared with other shotguns. This means players using the weapon will have to get fairly close to enemies to use it effectively. However this trait makes it a highly useful weapon for clearing rooms, or areas full of enemies. Using Extended Mags will increase the capacity to 16 shells, allowing prolonged fire. Using Extended Mags (With this attachment, there will be no extra mags, unless using Scavenger) combined with Scavenger it can make it a highly useful weapon, and has made some players use it as a "primary" weapon. Using a suppressor with this weapon is almost completely useless, as it shortens the range to roughly 5-10 yards, which means getting incredibly close to enemies to actually be able to hit them. The AA-12 is very effective on sabotage or demolition matches as it can clear out a room with ease due to its rate of fire.

Weapon Attachments

 * Red Dot Sight


 * Heartbeat Sensor (Campaign Only)


 * Suppressor


 * Grip


 * FMJ


 * Holographic Sight


 * Extended Magazines

Modern Warfare: Mobilized
In game, the AA-12 is used in the U.S. Marine missions, and can be found in the weapons room in the mission Training. It comes with a 32-round drum magazine by default, more damage and slightly lower rate of fire than the console and PC version. It is the second to last weapon to be unlocked for the USMC/SAS multiplayer faction.

Trivia

 * The AA-12 fires faster, has better range, and lower recoil in singleplayer than in multiplayer.


 * The AA-12 can have a Heartbeat Sensor attachment in single player and special ops and has a different reload when the Heartbeat Sensor is equipped (only available in single player); the empty magazine will actually be thrown away when reloading, instead of disappearing off-screen as is the case with other attachments. The Heartbeat Sensor is also very visible even when aiming down the sight, a characteristic that is shared with multiple weapons including the TAR-21 and the L86 LSW.


 * The AA-12's extended magazine attachment in-game doubles its ammo capacity to 16 shells. Strangely, as with most "extended mags", there has been no record of a 16 shell magazine ever made for the AA-12, although 20 and 32 shell drum magazines do exist in real life. It's unknown why Infinity Ward didn't decide to have the 20 shell drum magazine as an extended magazine, but it is possibly for balance reasons, or for the fact that normally only 16 shells are carried to begin with, meaning that a 20 shell magazine would start with four missing shells.


 * In Modern Warfare: Mobilized, the AA-12 has a Drum magazine. In the console version, it is not possible to equip the AA-12 with a drum magazine.


 * In the Spec Ops mission, Acceptable Losses, players start off with the AA-12 with three different attachments, the Red Dot Sight, Silencer and a Heartbeat Sensor. This cannot be achieved in multiplayer.


 * The AA-12 Shotgun is the only weapon of its type that requires the player to pull a charging handle during an empty reload.
 * In reality the AA-12 is a submachine gun not a shotgun.

Video
thumb|300px|left