Call of Duty Modern Warfare 3 (MW3)

How to Unlock EXF Relentless-40 Attachment

The EXF Relentless-40 is a gun attachment found under the Muzzles attachment category of Modern Warfare 3 (MW3). Check out our guide to learn how to unlock the EXF Relentless-40 and find out all compatible guns for this attachment!

How to Unlock EXF Relentless-40

Level Up Guns in MW3 Multiplayer Modes

The EXF Relentless-40 attachment can be unlocked by leveling up the following guns in MW3 multiplayer, Zombies, or Warzone:

Weapon Required Level
Modern Warfare 3 -RAAL MGRAAL MG Raise the RAAL MG to Level 21

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 EXF Relentless-40 attachment, early.

Once you unlock this feature, modify your chosen gun at the Gunsmith and select the EXF Relentless-40 from the Muzzle 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

EXF Relentless-40 Compatible Guns

Guns That Can Use the Attachment
Modern Warfare 3 -Lockwood 300Lockwood 300 Modern Warfare 3 -FTAC ReconFTAC Recon Modern Warfare 3 -FTAC ReconFTAC Recon
Modern Warfare 3 -RAAL MGRAAL MG Modern Warfare 3 -RAAL MGRAAL MG Modern Warfare 3 -Lockwood Mk2Lockwood Mk2
Modern Warfare 3 -MCPR-300MCPR-300 Modern Warfare 3 -LA-B 330LA-B 330 Modern Warfare 3 -SP-X 80SP-X 80
Modern Warfare 3 -Carrack .300Carrack .300 Modern Warfare 3 -FJX ImperiumFJX Imperium Modern Warfare 3 -KV InhibitorKV Inhibitor
Modern Warfare 3 -MCW 6.8MCW 6.8 Modern Warfare 3 -MTZ InterceptorMTZ Interceptor

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 Muzzles to Equip in MW3

Best MW3 Muzzles
This list is under construction!

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