The first set of Weekly Challenges is now available in Call of Duty: Modern Warfare 3's fourth season. Throughout the entire season, a set of challenges will be released each week that can be completed at any point throughout the season. These challenges are divided up between Multiplayer, Zombies, and Warzone. Complete any five of them, and you'll unlock a new aftermarket part, weapon, or cosmetic.

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This week's reward is the JAK Harbinger Kit for the M4, turning this weapon into a high-damage battle rifle. Jump into your favorite playlist, equip your favorite recommended weapon, and complete some challenges to get your hands on some of MW3's most unique rewards.

Week 1 Challenge Reward

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Completing any five of this week's challenges will unlock the JAK Harbinger Kit for the M4. This converts the M4 into a .50 Caliber battle rifle, substantially increasing its damage at the cost of fire rate and recoil control. The weapon's visual recoil and gun smoke are adjusted to MW3 standards while this attachment is equipped, so the kit is surprisingly easy to use once you get used to the recoil.

In terms of stats, it's an objectively better Sidewinder. It deals 101 damage per shot and fires at 245 RPM, allowing it to kill someone in two quick shots. The kit also reduces your handling and mobility stats.

This kit locks your magazine, ammo, and muzzle options.

Multiplayer Challenges

Multiplayer Challenges Challenge XP Reward Get 40 kills shortly after sprinting with a recommended assault rifle. 2,500 XP Get 25 kills with a recommended weapon after having recently swapped weapons. 5,000 XP Get 20 sliding or midair kills with recommended assault rifles. 5,000 XP Get 20 kills with iron sights equipped to a recommended marksman rifle. 5,000 XP Kill 15 enemies who are blinded or stunned with recommended assault rifles. 7,500 XP Finish 10 matches with 3+ players in your party. 7,500 XP Get 2 long-range throwing knife or sticky kills. 10,000 XP

Tips

  • Recommended weapons have a flame symbol beside their Create-A-Class icon.
  • Most marksman rifles have iron sights by default. Do not equip an optic.
  • A long-range throwing knife/semtex kill requires roughly 30m of throwing distance.
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Zombies Challenges

MWZ Challenges Challenge XP Reward Get 300 kills while ADS with a recommended assault rifle. 2,500 XP Get 150 kills with a recommended weapon after having recently swapped weapons. 5,000 XP Get 3 Disciple kills with a recommended weapon. 5,000 XP Get 100 hipfire kills with a recommended SMG. 5,000 XP Get 200 kills with Cryofreeze ammo installed on a recommended assault rifle. 7,500 XP Get 300 kills with a Pack-A-Punched recommended weapon. 7,500 XP Get 100 kills with a melee weapon. 10,000 XP

Tips

  • You must kill zombies roughly two seconds after switching weapons for the second challenge to count.
  • Cryo Ammo refers to the Cryofreeze ammo type. You can find this in Strongholds, Contract rewards, and as a craftable schematic.

Warzone Challenges

Battle Royale Challenges Challenge XP Reward In Warzone, open 75 loot caches. 2,500 XP In Urzikstan, kill 15 operators in the northwest region (Resort, Power, Seaport, Cargo). 5,000 XP In Urzikstan, kill 15 operators in the southern region (City, Suburbs, Manor). 5,000 XP Complete 15 Contracts. 5,000 XP In Urzikstan, kill 15 operators in the eastern region (Military Base or Farms). 7,500 XP In Urzikstan, kill 15 operators in the central region (Old Town, Low Town). 7,500 XP In Warzone, place in the top ten 7 times. 10,000 XP

Tip

  • The elimination challenges must be completed on Urzikstan. Other maps don't count.
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