How to get the JAK Harbinger kit in Modern Warfare 3 and Warzone

Lina PortmanJune 1, 2024

0 2 minutes read

The Modern Warfare 3 and Warzone Season 4 update adds the JAK Harbinger Kit to the growing list of spare parts.

However, this accessory for the iconic M4 assault rifle is initially locked, requiring players to follow a specific process to acquire it in-game.

Credit: Activision, ONE Esports

That said, here's everything you need to know to get the JAK Harbinger kit in Modern Warfare 3 and Warzone.

Here's how to unlock the JAK Harbinger kit spare part in MW3 and WZ

The JAK Harbinger is a .50 caliber conversion kit for the M4 assault rifle, which makes the weapon extremely deadly by improving its time to kill at the cost of a slow rate of fire, lower bullet speed and a significant increase in recoil.

Screenshot by Tarun Sayal/ONE Esports

The only way to unlock the JAK Harbinger Kit is to complete weekly challenges in Multiplayer, Zombies, or Warzone during Week 1 of Modern Warfare 3 and Warzone Season 4.

Here is the full list of Season 4 Week 1 challenges:

Credit: Activision, ONE Esports

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 the recommended Assault Rifles.	Get 300 kills while aiming down sights with a recommended assault rifle.	In Warzone Urzikstan, get 15 Operator kills in the Northwest region.
Get 25 Operator kills with a recommended weapon after recently switching weapons.	Acquire 150 kills with a recommended weapon after having recently changed weapons.	In Warzone Urzikstan, get 15 Operator kills in the Eastern region.
Get 20 operator kills while sliding or flying with the recommended assault rifles.	Get three disciples killed with a recommended weapon.	In Warzone Urzikstan, get 15 Operator kills in the southern region.
Get 20 Operator kills with iron sights equipped with a recommended sniper rifle.	Get 100 hipfire kills with a recommended SMG.	In Warzone Urzikstan, get 15 Operator kills in the Central region.
Get 15 kills against blinded or stunned operators with recommended assault rifles.	Get 200 kills with Frost damage with a recommended assault rifle.	In Warzone, place in the top 10 seven times.
Complete 10 matches with three or more players in your party.	Get 300 kills with a recommended Pack-a-Punched weapon.	In Warzone, complete 15 contracts.
Get two long range knife or sticky operator attacks.	Get 100 kills with a melee weapon.	In Warzone, open 75 loot caches.

Once you have completed at least five challenges from any of the main modes, you can access the JAK Harbinger kit in the M4 Assault Rifle loadout menu.

Credit: Activision, ONE Esports

We recommend completing the tasks in multiplayer to quickly obtain this spare part. Enter matches into Hardcore or Small Map Mosh Pit playlists.

Meanwhile, for Warzone players, complete challenges that involve first opening loot caches and completing contracts, then killing the Operator.

READ MORE: Modern Warfare 3 Season 4 Patch Notes: The Biggest Weapon Buffs and nerfs