Atlas 20mm

"Semi-automatic. Shoulder mounted with no hipfire. Best in class damage."

- In-game description.

The Atlas 20mm (referred to as THOR in the game files) is a shoulder-mounted sniper rifle featured in Call of Duty: Advanced Warfare.

Campaign
It makes a brief appearance in the mission "Utopia", where it is used by two enemy Atlas soldiers, but it is unobtainable since their position is unreachable.

Multiplayer
The Atlas 20mm is a semi-automatic sniper rifle, with a one hit kill from the shins up (including the entirety of the arms). Interestingly, it cannot be fired from the hip, forcing the player to manually scope in. The scope has a thick crosshair with a white circle around it. When aimed at an enemy, the circle turns red. It also has a very large amount of idle sway, making shots taken without holding the player's breath very hard.

Ballistic CPU is a good attachment choice, lowering idle sway to more manageable levels and limiting how much the player has to rely on holding their breath to get long range kills. Extended Mags may be another good attachment, as the player's ammo supply is quite limited. The Parabolic Microphone is helpful when the player is holed up in a sniping position, allowing the player to keep a watchful eye on those making the use of silenced weapons trying to sneak their way towards the player. However, it's only useful if the player keeps their eye on the radar.

It isn't a good idea to use this weapon in close quarter areas, so having a back up weapon is recommended, whether a fast switching handgun, or using Overkill to have a shotgun or SMG.

Attachments

 * Ballistic CPU
 * Stock
 * Parabolic Microphone
 * Extended Mags
 * Variable Zoom Scope (in Exo Survival only)

Exo Survival
The Atlas 20mm is unlocked upon reaching round 24; it costs 3 upgrade points. Unlike in multiplayer, it can equip a Variable Zoom Scope (though the HUD will erroneously read "Atlas 20mm Hybrid Sight").

Trivia

 * On the side of the weapon, there are thirteen tally marks plus two jet drawings. This can be seen when spinning to the right at a high sensitivity. The markings may represent how many jets/players the rifle has taken down, due to the cartridge main antimaterial purposes.
 * There is also text reading: "Before Handling Read Manual From: BALOR RIFLEWORKS"