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Call of Duty: Modern Warfare 3’sthird season has released its fourth set of Weekly Challenges. For the first eight weeks of a given season, a new set of challenges are released for Multiplayer, Zombies, and Warzone. Completing any five of these challenges will unlock an exclusive reward, usually an aftermarket part or a unique weapon blueprint.
This week’s reward is the JAK Revenger Kit, a conversion kit for the BP50 that turns it into a powerful SMG that is ideal for aggressive playstyles. This guide will briefly go over how this conversion kit works; then we’ll explain how to complete all of this week’s challenges as quickly as possible.

Week 4 Challenge Reward
After you complete any five of this week’s challenges, you’ll unlock theJAK Revenger Kit for the BP50.This converts the weapon into a 9mm SMG with absurdly good mobility stats, a fire rate of 983 RPM, and better handling stats. This does come at the cost of effective range and reload speed, although the latter is understandable since this attachment gives you a60 Round Drumfor free.
Since the BP50 was already a rather aggressive assault rifle, this conversion kit is a straight upgrade for virtually every build. This conversion kit doeslock your barrel, stock, comb, and underbarrel attachments, but the stat bonuses on offer more than compensate for this. If you tend to use the BP50 up close, the JAK Revenger KIt is absolutely worth getting.

Challenge
XP Reward
Get 30 kills with alternate ammo equipped to a recommended weapon.
2,500 XP

5,000 XP
Get 20 kills while ADS with a suppressed recommended SMG.
Get 15 kills while sliding or midair with a recommended weapon.
Get 10 longshot kills with recommended assault rifles.
7,500 XP
Get 3 kills in one magazine 10 times with recommended assault rifles.
Get 20 kills shortly after sprinting with a recommended assault rifle equipped with 5 attachments.
10,000 XP
Get 750 kills with a recommended Pack-A-Punched SMG.
Get 300 kills with a recommended assault rifle in the Medium Threat Zone.
Get 5 rapid kills 20 times with a recommended assault rifle.
Get 250 kills with a recommended assault rifle while affected by 4+ perks.
In Warzone, get 10 kills or kill assists with a recommended weapon.
In Urzikstan, open 20 loot caches in the northwest region (Resort, Power, Seaport, Cargo).
In Urzikstan, open 20 loot caches in the southern region (City, Suburbs, Manor).
Complete 15 contracts in Warzone.
In Urzikstan, open 20 loot caches in the eastern region (Military Base or Farms).
In Urzikstan, open 20 loot caches in the central region (Old Town, Low Town).