Call of Duty Modern Warfare 3 (MW3) Walkthrough & Guides Wiki

Call of Duty Modern Warfare 3 (MW3)

How to Unlock 40 Round Mag Attachment

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

List of Contents

How to Unlock 40 Round Mag

Level Up Guns in MW3 Multiplayer Modes

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

Weapon Required Level
Modern Warfare 3 -Lachmann SubLachmann Sub Raise the Lachmann Sub to Level 14
Modern Warfare 3 -Kastov 762Kastov 762 Raise the Kastov 762 to Level 14
Modern Warfare 3 -TAQ-56TAQ-56 Raise the TAQ-56 to Level 7
Modern Warfare 3 -Lachmann-556Lachmann-556 Raise the Lachmann-556 to Level 13
Modern Warfare 3 -MCWMCW Raise the MCW to Level 6
Modern Warfare 3 -Rival-9Rival-9 Raise the Rival-9 to Level 6
Modern Warfare 3 -LongbowLongbow Raise the Longbow to Level 24
Modern Warfare 3 -Holger 26Holger 26 Raise the Holger 26 to Level 8
Modern Warfare 3 -Holger 556Holger 556 Raise the Holger 556 to Level 13
Modern Warfare 3 -WSP SwarmWSP Swarm Raise the WSP Swarm to Level 21
Modern Warfare 3 -Striker 9Striker 9 Raise the Striker 9 to Level 15
Modern Warfare 3 -DG-56DG-56 Raise the DG-56 to Level 12
Modern Warfare 3 -DM56DM56 Raise the DM56 to Level 18
Modern Warfare 3 -RAM-7RAM-7 Raise the RAM-7 to Level 20
Modern Warfare 3 -RAM-9RAM-9 Raise the RAM-9 to Level 9

Complete the Attachment's Armory Unlock Challenge

Modern Warfare 3 - Armory Unlock Challenge for Attachments

Alternatively, players who have reached Account Level 25 can opt to complete Armory Unlock challenges to get the 40 Round Mag attachment, early.

Once you unlock this feature, modify your chosen gun at the Gunsmith and select the 40 Round Mag from the Magazine 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

40 Round Mag Compatible Guns

Guns That Can Use the Attachment
Modern Warfare 3 -Lachmann SubLachmann Sub Modern Warfare 3 -Lachmann ShroudLachmann Shroud Modern Warfare 3 -Kastov 762Kastov 762
Modern Warfare 3 -TAQ-56TAQ-56 Modern Warfare 3 -Lachmann-556Lachmann-556 Modern Warfare 3 -RPKRPK
Modern Warfare 3 -MCWMCW Modern Warfare 3 -Rival-9Rival-9 Modern Warfare 3 -LongbowLongbow
Modern Warfare 3 -Holger 26Holger 26 Modern Warfare 3 -Holger 556Holger 556 Modern Warfare 3 -WSP SwarmWSP Swarm
Modern Warfare 3 -Striker 9Striker 9 Modern Warfare 3 -DG-56DG-56 Modern Warfare 3 -WSP-9WSP-9
Modern Warfare 3 -DM56DM56 Modern Warfare 3 -RAM-7RAM-7 Modern Warfare 3 -RAM-9RAM-9

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

All Magazine Attachments in MW3

All Related Attachments
10 Round Mag 100 Round 556 Belt 100 Round Belt Mag
100 Round Box Mag 100 Round Drum 100 Round Mag
12 Round Mag 12 Shell Mag 125 Round Belt Mag
13 Round Mag 15 Round Mag 15 Round Magazine
150 Round Belt 150 Round Drum 150-Round Box Magazine
18 Round Mag 20 Round Drum 20 Round Mag
20 Round Magazine 200 Round 556 Belt 200 Round Belt
200 Round Belt Mag 24 Round Mag 25 Round Mag
25 Shell Drum 26 Round Mag 30 Round Drum
30 Round Mag 32 Round Mag 33 Round Mag
40 Round Drum 40 Round Mag 42 Round Mag
45 Round Mag 48 Round Mag 5 Round Mag
5 Round Magazine 5 Shell Mag 50 Round 762 Belt
50 Round Belt Mag 50 Round Drum 50 Round Mag
60 Round Drum 60 Round Mag 7 Round Mag
7 Round Magazine 7.62x51 30 Round Mag 72 Round Drum
75 Round Belt 8-Round Magazine 9 Round Mag
Fennec Double Tap Mod Fennec Mag 45 Geist Single-Tap Mod
Minibak Grip Mag MX Pro Mag Single Tap Mod
Stinger 25 Round Magazine

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