USAS 12

The  is a fully automatic shotgun that appears in Call of Duty: Modern Warfare 3.

Multiplayer
The USAS-12 is unlocked at level 4, as soon as Create-a-Class is available. The USAS-12 features lower damage compared to the similar shotguns, the AA-12 and the Striker, and is generally a 1-2 shot in close range, as well as having higher range than you would expect. These two features make it fairly reliable as far as power is concerned, but the USAS-12 has two major drawbacks, it only has a 6 round magazine and, despite being automatic, a very low rate of fire, thus limiting it effectiveness for spraying and demanding precise aim in order to effectively kill an enemy. Strong suggestions include Extended Mags and the Damage proficiency to allow more reliable one hit kills and greater ammo efficiency to circumvent its small magazine.

Spec Ops
The USAS 12 is infrequently used by enemies in Survival Mode, mostly used by the Suicide Bombers. As such, ammo is difficult to find and spending $750 to refill ammo is advisable. It can also be bought from the gun shop for $2000.

Weapon Attachments

 * Grip
 * Silencer
 * Red Dot Sight
 * Holographic Sight
 * Extended Mags

Video
Video:Modern Warfare 3: Kill Confirmed Gameplay

USAS 12 in action.

Trivia

 * It has the smallest magazine size of any fully automatic weapon, only having 6 shells before having to reload.
 * It is the second automatic shotgun in the Call of Duty series, the first being the AA-12.
 * It is the slowest automatic weapon to appear in the Modern Warfare series.
 * The USAS 12 has the same fire sound as the M1014 does in Modern Warfare 2.

ru:USAS 12Extending mag