Call of Duty Modern Warfare 3 (MW3) Walkthrough & Guides Wiki

Call of Duty Modern Warfare 3 (MW3)

How to Unlock JAK Harbinger Kit

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The JAK Harbinger Kit is an Aftermarket Parts Conversion Kit for the M4 in Call of Duty Modern Warfare 3 (MW3). Check out our guide to learn how to unlock the JAK Harbinger Kit, its detailed stats breakdown, and its converted weapon.

List of Contents

How to Unlock JAK Harbinger Kit

Complete 5 Week 1 Challenges

Players can get the JAK Harbinger Kit by completing 5 Week 1 Challenges in MW3 Multiplayer or Zombies. The JAK Harbinger Kit will be added to your available attachments once you have 5 completed challenges from one of game modes.

List of All Weekly Challenges and Rewards

JAK Harbinger Kit Converted Gun

Conversion Kit for the M4

The JAK Harbinger Kit is a full conversion kit for the M4. When equipped, it transforms the M4 into a high-damage rifle at the cost of its rate-of-fire, recoil control, and overall stability.

M4 Best Loadout and Build

JAK Harbinger Kit Stats

Pros and Cons

Pros Cons
Modern Warfare 3 - Major ProDamage
Modern Warfare 3 - Major ConFire Rate
Modern Warfare 3 - Major ConRecoil Control
Modern Warfare 3 - Major ConFlinch Resistance
Modern Warfare 3 - Major ConGun Kick Control

Chevron count determines the effectivesness of the stat change while polygonal arrows indicate a new function being added.

Detailed Stat Adjustments

Damage
Headshot Damage 110.0 (+197%)
Upper Torso Damage 101.0 (+197%)
Lower Torso Damage 101.0 (+197%)
Target Flinch 0.8 N
Range
Effective Damage Range 12.7 m (-52%)
Minimum Damage Range 45.7 m
Bullet Velocity 720.0 m/s
Fire Rate
Rate of Fire 245.9 rpm (-70%)
Recoil Control
Recoil Gun Kick 61.38 degree/s (+210%)
Horizontal Recoil 22.72 degree/s (+67%)
Vertical Recoil 73.74 degree/s (+52%)
Accuracy
Hipfire Spread Min 2.6 degree/s
Hipfire Spread Max 7.5 degree/s
Flinch Resistance 0.25 N (+47%)
Tactical Stance Spread 4.1 degree/s
Mobility
Movement Speed 4/2 m/s (-14%)
Crouch Movement Speed 1.9 m/s (-14%)
Sprint Speed 4.9 m/s (-11%)
Tactical Sprint Speed 6.3 m/s (-10%)
ADS Movement Speed 2.5 m/s (-14%)
Handling
ADS Speed 320.0 ms (+33%)
Reload Quickness 2.8 s (+8%)
Sprint to Fire Speed 231.0 ms (+10%)
Swap Speed 1500.0 ms

Modern Warfare 3 (MW3) Related Guides

Modern Warfare 3 - Attachments

List of All Attachments

Attachment Types in MW3

Attachments By Type
Barrel Stock Ammunition Muzzle
Rear Grip Optic Underbarrel Magazine
Receiver Laser Comb Trigger Action
Guard Bolt Arm Rail
Carry Handle Lever Loader Wire
Conversion Kit

All Conversion Kits in MW3

All Related Attachments
Broodmother .45 Kit JAK Annihilator Bullpup Kit JAK Atlas Kit
JAK Backsaw Kit JAK Beholder Rifle Kit JAK Burnout
JAK Ettin Double Barrel Kit JAK Ferocity Carbine Kit JAK Harbinger Kit
JAK Headhunter Carbine Conversion JAK Heretic Carbine Kit JAK Jawbreaker
JAK Maglift Kit JAK Nightshade Rifle Kit JAK Outlaw-277 Kit
JAK Patriot JAK Raven Kit JAK Revenger Kit
JAK Shadow Titan Kit JAK Signal Burst JAK Thunder LMG Kit
JAK Tyrant 762 Kit JAK Wardens (Model 1887) MCW 6.8 Full-Auto Conversion Kit
WSP Akimbo Brace Stock XRK IP-V2 Conversion Kit

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