- "This .50 Cal conversion kit for the M4 is an extremely deadly, quick-kill weapon. The slow fire rate, drop in bullet velocity, and a significant increase in recoil will require a careful hand."
- — In-game description
The JAK Harbinger Kit is a conversion kit for the M4 Assault Rifle featured in Call of Duty: Modern Warfare III as part of the Aftermarket Parts system. It was added as part of the Season Four update.
The JAK Harbinger Kit blocks the modification of the muzzle, ammo type, and magazine while also granting the player two new barrels to use, the Beast Fifty Long Barrel, and the Mortar 50 Short Barrel. It also changes the magazine into a 15-round mag. It increases damage to a two-hit kill to all parts of the body in exchange for overall recoil control, fire-rate and flinch resistance.
Trivia[]
- In the Season Three announcement blog post, an image of the JAK Harbinger Kit was used for the JAK Cutthroat Stock. This image of the JAK Harbinger Kit has a noticeably longer barrel than the final version of the Conversion Kit and features the default M4 Stock.[1]
- The attachment description states that the weapon uses .50 Cal, but the in-game bullet caliber is stated as .450 Huntsman.