Call of Duty Modern Warfare 3 (MW3)

How to Unlock 600mm FR Longbore Attachment

The 600mm FR Longbore is a gun attachment found under the Barrels attachment category of Modern Warfare 3 (MW3). Check out our guide to learn how to unlock the 600mm FR Longbore and find out all compatible guns for this attachment!

How to Unlock 600mm FR Longbore

Level Up Guns in MW3 Multiplayer Modes

The 600mm FR Longbore attachment can be unlocked by leveling up the following guns in MW3 multiplayer, Zombies, or Warzone:

Weapon Required Level
Modern Warfare 3 -FR AvancerFR Avancer Raise the FR Avancer to Level 3
Modern Warfare 3 -FR 5.56FR 5.56 Raise the FR 5.56 to Level 14

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 600mm FR Longbore attachment, early.

Once you unlock this feature, modify your chosen gun at the Gunsmith and select the 600mm FR Longbore from the Barrel 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

600mm FR Longbore Compatible Guns

Guns That Can Use the Attachment
Modern Warfare 3 -FR AvancerFR Avancer Modern Warfare 3 -FR 5.56FR 5.56

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 Barrels to Equip in MW3

Best MW3 Barrels
This list is under construction!

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