The fifth week of Call of Duty: Modern Warfare 3's first season has introduced the JAK Signal Burst Conversion Kit to the sandbox. This is an Aftermarket attachment that converts the Holger 556 into a four-round burst gun, capable of killing an enemy player with one burst.

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Obtaining this attachment will require you to complete five weekly challenges added this week, most of which revolve around Holger 556 kills. This guide will explain how the Holger 556's JAK Signal Burst Conversion Kit works, and we'll give tips on how to complete every weekly challenge for Multiplayer, Modern Warfare Zombies, and Warzone.

Week 5 Challenge Reward

Completing five of this week's challenges will award the JAK Signal Burst Conversion Kit for the Holger 556. This turns the Holger into a four-round burst rifle, sacrificing handling stats for a slightly faster TTK. It also comes with built-in optic and laser attachments. You cannot install barrel or laser attachments onto this conversion kit, but optics are fair game.

Since the Holger can kill an enemy with four rounds to the chest, the JAK Signal Burst can one-burst targets in Multiplayer, making it a strong alternative to the FR 5.56 and DG-56. Firing aim stability seems to be quite low on this conversion kit, so be sure to pair this Aftermarket part with a few accuracy attachments.

Multiplayer Challenges

Multiplayer Challenges

Challenge

XP Reward

Get 30 kills while aiming down sights (ADS) with a recommended weapon.

2,500 XP

Get 30 kills with a recommended battle rifle.

5,000 XP

Get 30 kills with the Holger 556.

5,000 XP

Get 30 kills with an optic equipped to a recommended assault rifle.

5,000 XP

Get 30 headshot kills with the Holger 556.

7,500 XP

Get 10 longshot kills with the Holger 556.

7,500 XP

Get 5 fury kills with a recommended battle rifle.

10,000 XP

Tips And Notes

  • See our Holger 556 guide for attachment recommendations.
  • A fury kill is when you eliminate four enemies within a short period, roughly 10-15 seconds.
    • This is not the same as a quad kill.
  • For longshots, consider playing Ground War or War Mode.
  • Use the BAS-B for easy battle rifle kills.
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Zombies Challenges

MWZ Challenges

Challenge

XP Reward

Get 750 kills while ADS with a recommended weapon.

2,500 XP

Get 300 kills with a recommended battle rifle.

5,000 XP

Get 250 kills with the Holger 556.

5,000 XP

Get 250 scoped kills with a recommended assault rifle.

5,000 XP

Get 250 critical kills with the Holger 556.

7,500 XP

Get 250 kills with a Pack-A-Punched Holger 556.

7,500 XP

Get 3 mimic kills with a recommended battle rifle.

10,000 XP

Tips And Notes

  • Start an MWZ match with a Holger 556, Aetherium Crystal, and Aether Tool. Farm contracts or evac points to rack up a high kill count.
  • Scoped kills simply require you to have an optic installed on your weapon. Any magnification will work, even red dots.
  • For battle rifle kills, we recommend using the BAS-B or the MTZ-762.

Warzone Challenges

Battle Royale Challenges

Challenge

XP Reward

Open 50 loot caches.

2,500 XP

In Urzikstan, get 10 operator kills in the northwest region (Resort, Power, Seaport, Cargo).

5,000 XP

In Urzikstan, get 10 operator kills in the southern region (City, Suburbs, Manor).

5,000 XP

Complete 15 contracts in Warzone.

5,000 XP

In Urzikstan, get 10 operator kills in the eastern region (Military Base or Farms).

7,500 XP

In Urzikstan, get 10 operator kills in the central region (Old Town, Low Town).

7,500 XP

Tips And Notes

  • Consider playing Plunder to earn kills in a low-stakes environment.
  • Lootable containers emit an audible hum. Keep an ear out for it during the start of a game.
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