The debut of Season 4 forModern Warfare 3andWarzonebrings additional maps and modes for Multiplayer, the DNA Bomb Killstreak, developments tothe bunkers on Urzikstan, and revamps toWarzone’sGulag. Though a Battle Pass featuring three additional weapons has also provided players with alternative armaments to add to their loadouts, the Week 1 Challenges also allow players to acquire the JAK Harbinger aftermarket part for the M4.

The JAK Harbinger Kit is an aftermarket part forthe M4 Assault RifleinModern Warfare 3andWarzone. Equipping this conversion kit provides a significant increase in overall damage at the expense of fire rate, recoil control, accuracy, mobility, and handling. Though using this kit results in serious weapon kick, this can be mitigated with the best attachments. Here isthe best JAK Harbinger M4 loadout inModern Warfare 3andWarzone.

How To Unlock The JAK Harbinger Aftermarket Part for the M4 in Modern Warfare 3 and Warzone

How To Unlock The JAK Harbinger Aftermarket Part

The JAK Harbinger Aftermarket Part is a free reward tied to the Week 1 Challenges forModern Warfare 3andWarzone. To unlock it, players need tocomplete 5 out of the 7 Week 1 Challengesin either Multiplayer, Zombies, or Battle Royale. To find the Week 1 Challenges, players can head to the Challenges Tab via the Launcher Menu.

Upon Season 4’s conclusion, players will be able to acquire the JAK Harbinger Aftermarket Part asan Armory Unlock.

Best MW3 M4 JAK Harbinger Loadout

Best MW3 M4 JAK Harbinger Loadout

The below M4 JAK Harbinger build is made specifically withModern Warfare 3’sMultiplayer in mind, with an emphasis on keeping mobility and handling close to baseline levels. Along with improved aim-down-sight speed and sprint-to-fire speeds, accuracy and damage are also increased. Though far fromthe best weapon inModern Warfare 3, this build does provide players with the means to quickly engage in gunfights, along with eliminating players with a reliable two-shot kill on opponents.

Best Equipment

Though the JAK Harbinger Kit for the M4 provides players with a high-damage weapon for Multiplayer, the low magazine size and ammo reserve do limit it quite a lot. This calls for players to equip a reliable Secondary to swap to when they are unable to reload. Weapons from the Handgun category will do the trick, with some of the top picks including theWSP Stinger, theTYR, andtheRenetti.

Best Warzone M4 JAK Harbinger Loadout

The below M4 JAK Harbinger build is created to be viable forWarzoneBattle Royale. Running the attachments below boosts damage along with range, all while keeping accuracy close to baseline levels. Unfortunately, handling and mobility have been reduced, but this build is rather effective for taking down armored opponents from medium-range and beyond.

Best Perk Package

The JAK Harbinger Kit for the M4 converts the weapon into a 50-Caliber Rifle, boosting damage and shredding opponent’s armor plates inWarzoneBattle Royale. However, the weapon is held back by its low magazine size and ammo reserve. Due to this flaw, players will greatly benefit from equipping a Submachine Gun to switch to during high-intensity gunfights. Some top considerations for the category include theStriker-9, theRAM-7, andtheWSP-Swarm.

the best Modern Warfare 3 gear for the M4 JAK Harbinger Loadout

Screenshot showcasing WSP Stinger in Call of Duty Modern Warfare 3 and Warzone

Best Warzone M4 JAK Harbinger Loadout

the best Warzone perks for the M4 JAK Harbinger Loadout

wsp swarm smg in modern warfare 3.

Call Of Duty: Modern Warfare 3 (2023) Tag Page Cover Art