Call of Duty Modern Warfare 3 (MW3)

How to Unlock SPW 40mm HE Attachment

The SPW 40mm HE 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 SPW 40mm HE and find out all compatible guns for this attachment!

How to Unlock SPW 40mm HE

Level Up Guns in MW3 Multiplayer Modes

The SPW 40mm HE attachment can be unlocked by leveling up the following guns in MW3 multiplayer, Zombies, or Warzone:

Weapon Required Level
Modern Warfare 3 -M16M16 Raise the M16 to Level 13
Modern Warfare 3 -Holger 556Holger 556 Raise the Holger 556 to Level 24

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 SPW 40mm HE attachment, early.

Once you unlock this feature, modify your chosen gun at the Gunsmith and select the SPW 40mm HE 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

SPW 40mm HE Compatible Guns

Guns That Can Use the Attachment
Modern Warfare 3 -M13CM13C 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 -SidewinderSidewinder Modern Warfare 3 -RAM-7RAM-7 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!

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