Call of Duty Modern Warfare 3 (MW3)

How to Unlock Corvus Masterkey Attachment

The Corvus Masterkey is a gun attachment found under the Underbarrels attachment category of Modern Warfare 3 (MW3). Check out our guide to learn how to unlock the Corvus Masterkey and find out all compatible guns for this attachment!

How to Unlock Corvus Masterkey

Level Up Guns in MW3 Multiplayer Modes

The Corvus Masterkey attachment can be unlocked by leveling up the following guns in MW3 multiplayer, Zombies, or Warzone:

Weapon Required Level
Modern Warfare 3 -Kastov 545Kastov 545 Raise the Kastov 545 to Level 18

Complete the Attachment's Armory Unlock Challenge

Alternatively, players who have reached Account Level 25 can opt to complete Armory Unlock challenges to get the Corvus Masterkey attachment, early.

Once you unlock this feature, modify your chosen gun at the Gunsmith and select the Corvus Masterkey from the Underbarrel attachment slot of your weapon. This should activate its Armory Unlock contract, allowing you to complete Daily and Bonus Challenges to get it earlier.

Armory Unlock Challenges

Corvus Masterkey Compatible Guns

Guns That Can Use the Attachment
Modern Warfare 3 -Kastov 545Kastov 545 Modern Warfare 3 -Kastov 762Kastov 762 Modern Warfare 3 -M4M4
Modern Warfare 3 -M16M16 Modern Warfare 3 -TAQ-56TAQ-56 Modern Warfare 3 -ISO HemlockISO Hemlock
Modern Warfare 3 -M13BM13B Modern Warfare 3 -M13CM13C Modern Warfare 3 -Lachmann-556Lachmann-556
Modern Warfare 3 -KV BroadsideKV Broadside Modern Warfare 3 -TAQ-VTAQ-V Modern Warfare 3 -FTAC ReconFTAC Recon
Modern Warfare 3 -Cronen SquallCronen Squall Modern Warfare 3 -TAQ-MTAQ-M Modern Warfare 3 -Tempus TorrentTempus Torrent
Modern Warfare 3 -MCWMCW Modern Warfare 3 -Bas-BBas-B Modern Warfare 3 -MTZ-762MTZ-762
Modern Warfare 3 -RiveterRiveter Modern Warfare 3 -Holger 556Holger 556 Modern Warfare 3 -DG-56DG-56
Modern Warfare 3 -SidewinderSidewinder Modern Warfare 3 -RAM-7RAM-7 Modern Warfare 3 -BP50BP50
Modern Warfare 3 -STG44STG44 Modern Warfare 3 -DTIR 30-06DTIR 30-06

Modern Warfare 3 (MW3) Related Guides

Modern Warfare 3 - Attachments

List of All Attachments

Attachment Types in MW3

Attachments By Type
Barrel Stock Ammunition Muzzle
Rear Grip Optic Underbarrel Magazine
Receiver Laser Comb Trigger Action
Guard Bolt Arm Rail
Carry Handle Lever Loader Wire
Conversion Kit

Best Underbarrels to Equip in MW3

Best MW3 Underbarrels
This list is under construction!

Author

    Walkthrough Menu

    All rights reserved