MW3 Warzone JAK Harbinger Kit
Image via Activision

How to Get JAK Harbinger Kit in MW3 and Warzone

Giving a classic weapon a powerful makeover

Call of Duty: Modern Warfare 3 and Warzone continue to add more Aftermarket Parts to its armory in Season 4 with the JAK Harbinger Kit that turns the M4 assault rifle into a .50 Cal sniper. Here is how to get the JAK Harbinger Kit in MW3 and Warzone.

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How to Unlock JAK Harbinger Kit in MW3 and Warzone

MW3 Warzone JAK Harbinger Kit
Screenshot by Prima Games

The JAK Harbinger Kit can be unlocked by completing five Season 4 Week 1 challenges. The requirement will be in place until Season 4 ends, then players will have to unlock it from the Armory after the season is over.

There are a total of 21 Week 1 challenges to be completed among MW3 multiplayer, Zombies, and Warzone modes. Only five in the set need to be done to unlock the JAK Harbinger Kit. However, Call of Duty: Warzone Mobile players will have to spend Arsenal Coins in the Arsenal Store to unlock the Aftermarket Part.

Here are all the Season 4 Week 1 challenges that can be completed:

MW3 Multiplayer

  • Get 40 Operator kills shortly after sprinting with recommended assault rifles
  • Get 25 Operator kills with a recommended weapon after having recently swapped weapons
  • Get 20 Operator kills sliding or midair kills with recommended assault rifles
  • Get 20 Operator kills with iron sights equipped to a recommended marksman rifle
  • Get 15 kills against Operators who are blinded or stunned with recommended assault rifles
  • Get two long range throwing knife or sticky Operator kills
  • Finish 10 matches with three or more players in your party

MW3 Zombies

  • Get 300 kills while aiming down sights with a recommended assault rifle
  • Get 300 kills with a Pack-A-Punched Recommended Weapon
  • Get 200 kills with frost damage with a recommended assault rifle
  • Get 150 kills with a recommended weapon after having recently swapped weapons
  • Get 100 hipfire kills with a recommended SMG
  • Get 100 kills with a melee weapon
  • Get three Disciple kills with a recommended weapon

COD Warzone

  • In Warzone Urzikstan, get 15 Operator kills in the North-West Region (Resort, Power, Seaport, Cargo)
  • In Warzone Urzikstan, get 15 Operator kills in the Southern Region (City, Suburbs, Manor)
  • In Warzone Urzikstan, get 15 Operator kills in the Eastern Region (Military Base or Farms)
  • In Warzone Urzikstan, get 15 Operator kills in the Central Region (Old Town, Low Town)
  • In Warzone, place in the top 10 seven times
  • In Warzone, complete 15 contracts
  • In Warzone, open 75 Loot Caches

For more on Season 4 across Modern Warfare 3 and Warzone, please check out how to get the Kar98K for some old-school fun.


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Tom Meyer
Freelancer with bylines at various gaming outlets for a decade. Covers new releases, shooters, and the odd RPG. Started with Super Mario Bros. and Jack Nicklaus' Greatest 18 Holes of Major Championship Golf, and not planning to stop anytime soon.