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Call of Duty: Modern Warfare 3’sfourth season has added some new Aftermarket Parts, most of which fundamentally overhaul how a weapon behaves. The first conversion kit of the season is the JAK Harbinger Kit for the M4, converting it into a .50 Caliber battle rifle.
The weapon kicks like a mule, but it will obliterate anything you’re aiming at. Get accustomed to the recoil, and you may dominate mid-range duels with little issue. This short guide will explain how to get the JAK Harbinger Kit and how to maximize it with Gunsmith attachments.
How To Unlock The JAK Harbinger Kit
The JAK Harbinger Kit is tied toSeason 4’s Weekly Challenge system.You must complete any five challenges tied toSeason 4’s first set of Weekly Challenges. You can check these challenges by opening the main menu and selecting “Challenges” → “Weekly.”
You’ll be able to install this kit on theM4 from MW2.If you have not unlocked this weapon yet, you’re able to do so throughthe Armory Unlock system.
The Best JAK Harbinger Build
This build is quite slow, but you’ll have an accurate battle rifle that can two-tap players in core Multiplayer. We start with the conversion kit itself. TheJAK Harbinger Kitsubstantially reduces the weapon’s fire rate, lowering it to 245RPM. In turn, your base damage is over doubled, allowing this gun to two-tap. Recoil becomes an issue with this kit, so we focus the rest of our attachments on fixing it.
TheSakin ZX Grip, Beast Fifty Long Barrel, and Bruen Pivot Vertical Gripall help reduce the weapon’s jumpy recoil pattern. It still has some horizontal deviation, but it should be fairly easy to use at medium range. We then throw onan opticto make target acquisition a little easier. If you own it, use theJAK Glassless Opticfor a boost to your firing aim stability.
Loadout Recommendations
Since this weapon isn’t suppressed, you ideally want a more aggressive loadout. TheInfantry Vestis a solid pick for most builds, giving you Running Sneakers for free. We then useMag Holsterto reload the weapon as quickly as possible.Covert Sneakersmuffle your footstep audio, although you can any other pair of boots if you prefer.Marksman Glovesreduce incoming flinch, andStimswill heal you after a tough gunfight. Everything else is down to preference.
