Modern Warfare 3 and Warzone Season 4 update adds the JAK Harbinger Kit in the growing list of aftermarket parts.
However, this attachment for the iconic M4 assault rifle is initially locked, requiring players to complete a specific process to acquire it in the game.
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With that said, here’s all you need to know about obtaining the JAK Harbinger Kit in Modern Warfare 3 and Warzone.
Here’s how to unlock the JAK Harbinger Kit aftermarket part in MW3 and WZ
The JAK Harbinger is a .50 Cal conversion kit for the M4 assault rifle, which makes the weapon extremely deadly by improving its time to kill at the cost of slow fire rate, drop in bullet velocity, and a significant increase in recoil.
The only way to unlock the JAK Harbinger Kit is by completing weekly challenges in Multiplayer, Zombies, or Warzone during week 1 of Modern Warfare 3 and Warzone Season 4.
Here’s the complete list of season 4 week 1 challenges:
| MW3 MULTIPLAYER SEASON 4 WEEK 1 CHALLENGES | MW3 ZOMBIES SEASON 4 WEEK 1 CHALLENGES | WARZONE SEASON 4 WEEK 1 CHALLENGES |
| Get 40 operator kills shortly after sprinting with recommended assault rifles. | Get 300 kills while aiming down sights with a recommended assault rifle. | In Warzone Urzikstan, get 15 operator kills in the North-West region. |
| Get 25 operator kills with a recommended weapon after having recently swapped weapons. | Get 150 kills with a recommended weapon having recently swapped weapons. | In Warzone Urzikstan, get 15 operator kills in the Eastern region. |
| Get 20 operator sliding or midair kills with recommended assault rifles. | Get three Disciple kills with a recommended weapon. | In Warzone Urzikstan, get 15 operator kills in the Southern region. |
| Get 20 operator kills with iron sights equipped to a recommended marksman rifle. | Get 100 hipfire kills with a recommended SMG. | In Warzone Urzikstan, get 15 operator kills in the Central region. |
| Get 15 kills against operators who are blinded or stunned with recommended assault rifles. | Get 200 kills with Frost damage with a recommended assault rifle. | In Warzone, place in the top 10 seven times. |
| Finish 10 matches with three or more players in your party. | Get 300 kills with a Pack-a-Punched recommended weapon. | In Warzone, complete 15 contracts. |
| Get two long-range throwing knife or sticky operator kills. | Get 100 kills with a melee weapon. | In Warzone, open 75 loot caches. |
Once you complete at least five challenges from any of the primary modes, you can access the JAK Harbinger Kit in the loadout menu for the M4 assault rifle.
We recommend completing the tasks in Multiplayer to quickly obtain this aftermarket part. Enter matches in Hardcore or Small Map Mosh Pit playlists.
Meanwhile, for Warzone players, finish challenges that involve opening loot caches and completing contracts first, then go for the operator kills.
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READ MORE: Modern Warfare 3 Season 4 patch notes: Biggest weapon buffs and nerfs
