Best M13B Loadout: Modern Warfare 3 & Warzone 2

The M13B is currently an A-Tier weapon in the MW3 meta and an A-Tier weapon in the WZ2 meta. We breakdown the best M13B loadouts and builds, how to unlock the M13B, and how to complete M13B camo challenges.

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The M13B is an assault rifle and was released with the Season 1 Reloaded update of MW2 on December 14, 2022. It may be used in Warzone 2 and weapon progress carries over into MW3.

M13B: Key Takeaways

  • The M13B is currently an A-Tier option in the MW3 meta and an A-Tier option in the Warzone 2 meta
  • The current best loadout attachments for the M13B in MW3 are: Echoless-80, VLK LZR 7mW, Slimline Pro, D37 Grip, and 45 Round Mag
  • The current best loadout attachments for the M13B in Warzone 2 are: Harbinger D2014′ Bruen EchelonAIM OP-V4FTAC Ripper 56, and 60 Round Mag

For a meta AR loadout check out the Kastov 762.

Best M13B Loadout Warzone

  • Muzzle: Harbinger D20
  • Barrel: 14″ Bruen Echelon
  • Optic: Aim OP-V4
  • Underbarrel: FTAC Ripper 56
  • Magazine: 60 Round Mag

Best M13B Loadout MW3

  • Muzzle: Echoless-80
  • Laser: VLK LZR 7mW
  • Optic: Slimline Pro
  • Rear Grip: D37 Grip
  • Magazine: 45 Round Mag

Best M13B Loadout MW2

  • Muzzle: Echoless-80
  • Laser: VLK LZR 7mW
  • Optic: Slimline Pro
  • Rear Grip: D37 Grip
  • Magazine: 45 Round Mag

Unlocking the M13B

To unlock the M13B a player must first defeat “The Chemist” in the radiation zone in DMZ. Then extract with his dropped M13B blueprint.

M13B Camo Challenges

Players must reach the required weapon level before challenge progress can be made towards unlocking the camo.

M13B Multiplayer Camo Challenges

CamoChallengeUnlock Level
TarnishedGet 50 kills with the M13B2
Field OpsGet 10 double kills with the M13B9
ProjectileGet 15 point blank kills with the M13B15
Ice CaveGet 15 kills from behind with the M13B19
GoldGet 3 kills without dying 10 times with the M13BComplete all base camo challenges
PlatinumGet 25 longshot kills with the M13BComplete 8 Gold challenges with ARs
PolyatomicGet 25 headshot kills with the M13BComplete 51 Platinum camo challenges
OrionN/AComplete 51 Polyatomic camo challenges

M13B Zombie Camo Challenges

CamoChallengeUnlock Level
Moldy MembraneIn Zombies, Get 250 kills with the M13B2
Looming ShadowIn Zombies, Get 10 kills in 5 seconds 10 times with the M13B9
TormentorIn Zombies, Get 250 hipfire kills with the M13B15
Final VisageIn Zombies, Get 50 Mercenary kills with the M13B19
Golden IvoryIn Zombies, Get 100 kills and successfully extract with the M13B in a single deploymentComplete all zombie base camo challenges
Spinal HuskIn Zombies, Get 300 kills with the M13B while it’s Pack-A-PunchedComplete 8 Golden Ivory challenges with ARs
ArachnidaIn Zombies, Get 10 Special or Elite Zombie kills with the M13BComplete 51 Spinal Husk camo challenges
BioluminescentN/AComplete 51 Arachnida camo challenges

Looking to test or share your M13B loadouts?

Zleague.gg has one of the largest communities of Warzone players on our mobile app. Download the app today and try the LFG feature to form new squads.

You can also test out your loadouts in competitive play with Z League’s Warzone tournaments. All of Z League’s tournaments leverage proprietary skill-based matchmaking (SBMM) algorithms to ensure that you’re always placed in a division with similarly skilled players.