Call of Duty Modern Warfare 3 (MW3)

How to Unlock XTen RR-40 Attachment

The XTen RR-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 XTen RR-40 and find out all compatible guns for this attachment!

How to Unlock XTen RR-40

Level Up Guns in MW3 Multiplayer Modes

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

Weapon Required Level
Modern Warfare 3 -PDSW 528PDSW 528 Raise the PDSW 528 to Level 13

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 XTen RR-40 attachment, early.

Once you unlock this feature, modify your chosen gun at the Gunsmith and select the XTen RR-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

XTen RR-40 Compatible Guns

Guns That Can Use the Attachment
Modern Warfare 3 -VEL 46VEL 46 Modern Warfare 3 -MX9MX9 Modern Warfare 3 -Lachmann SubLachmann Sub
Modern Warfare 3 -Vaznev-9KVaznev-9K Modern Warfare 3 -FSS HurricaneFSS Hurricane Modern Warfare 3 -MinibakMinibak
Modern Warfare 3 -PDSW 528PDSW 528 Modern Warfare 3 -Fennec 45Fennec 45 Modern Warfare 3 -ISO 45ISO 45
Modern Warfare 3 -ISO 9mmISO 9mm Modern Warfare 3 -WSP StingerWSP Stinger Modern Warfare 3 -Bas-PBas-P
Modern Warfare 3 -FTAC SiegeFTAC Siege Modern Warfare 3 -WSP SwarmWSP Swarm Modern Warfare 3 -Striker 9Striker 9
Modern Warfare 3 -WSP-9WSP-9 Modern Warfare 3 -HRM-9HRM-9 Modern Warfare 3 -RAM-9RAM-9
Modern Warfare 3 -FJX HorusFJX Horus Modern Warfare 3 -Superi 46Superi 46

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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