USAS 12

The  is an 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 a lower rate of fire compared to the other automatic shotgun, the AA-12; however, it has much more carried ammunition (36 total rounds as opposed to 16). In addition, the USAS-12 has the smallest magazine size of any shotgun and one of the slowest reloads, necessitating Extended Mags and/or Sleight of Hand. Nevertheless, the USAS 12 has the highest range of any of the shotguns (tied with the SPAS-12), but has very low damage at the edge of its range. Damage or Range is highly recommended, as with all shotguns. At medium range with the damage proficiency, most kills will take one or two shots.

One unique hidden feature of the USAS-12 is that it gives the user doubled sprint time when equipped on the Xbox 360, similar to the effects of Extreme Conditioning. This effect can be combined with the aforementioned perk to allow the player to sprint for unparalleled distances.

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 weapons armory for $2000.

Weapon Attachments

 * Grip - Unlocked at weapon level 2.
 * Silencer - Unlocked at weapon level 5.
 * Red Dot Sight - Unlocked at weapon level 12.
 * Holographic Sight - Unlocked at weapon level 17.
 * Extended Mags - Unlocked at weapon level 26.

Profeciencies

 * Kick - Unlocked at weapon level 4.
 * Focus - Unlocked at weapon level 9.
 * Attachments - Unlocked at weapon level 14.
 * Melee - Unlocked at weapon level 19.
 * Range - Unlocked at weapon level 23.
 * Damage - Unlocked at weapon level 28.

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 six shells before having to reload.
 * It is the second automatic shotgun in the Call of Duty series, the first being the AA-12.
 * The USAS 12 has the same fire sound as the M1014 does in Modern Warfare 2.
 * The Marksman III challenge is incorrectly achieved upon 300 kills with this weapon as opposed to the usual 75.

USAS 12