All MW3 aftermarket parts and how to unlock them

We have compiled a list of all MW3 aftermarket parts and how to unlock them, taking the weapons you love and turning them into a different beast.

MW3 aftermarket parts: two soldiers battling it out in a favela, both firing their weapons.

How do you unlock MW3 aftermarket parts? A new feature for Modern Warfare 3 aftermarket parts are modifications to your weapons that fundamentally change how they function. The primary focus of riddling your enemies with holes stays the same, but with aftermarket parts, you can alter how they do it, in quite a dramatic fashion.

The Modern Warfare 3 release date is here, and so far, there have been several stand-out weapons, with the Striker 45 sitting at the top of the pile. But what happens when MW3 aftermarket parts drop? Will we see another weapon take the top spot? Here are all the Modern Warfare 3 aftermarket parts we know of and how to unlock them.

Season 1 new aftermarket parts

With the release of season 1 comes a host of new aftermarket parts for you to further customize your favorite weapons. These parts can be attached to a variety of different weapons, which we have detailed below:

JAK Purifier

An underbarrel flamethrower for fights in enclosed spaces, where your enemy doesn’t have space to escape. The JAK Purifier is compatible with:

  • MCW
  • MTZ-556
  • Holger 556
  • DG-56
  • SVA 545
  • RAM-7
  • MTZ-762
  • BAS-B
  • Sidewinder
  • Riveter

JAK Ettin Double Barrel kit

Adding an extra barrel to the AMR9 doubles your damage output, but adds a significant amount of recoil to the gun. The JAK Ettin Double Barrel kit is compatible with:

  • AMR9

JAK Thunder LMG kit

A conversion kit for the Sidewinder battle rifle that adds a much larger ammo reserve, and a ramp in fire rate based on how long you hold down the trigger. The JAK Thunder LMG kit is compatible with:

  • Sidewinder


A barrel attachment that significantly decreases recoil, while increasing your impact on the minimap while firing. They’ll know where you are, but you should be able to eliminate anyone who comes your way. The JAK BRB is compatible with nearly every assault rifle, submachine gun, battle rifle, marksman rifle, and sniper rifle.

JAK Bullseye

A low-impact dot optic. Compatibility is currently unknown.

JAK Glasseye

An optic designed for easy target acquisition and a clear sight picture. Compatibility is currently unknown.

JAK Signal Burst

A conversion kit designed for accuracy, converting an assault rifle’s full-auto firing mode with a four-round burst. The JAK Signal Burst is compatible with:

  • Holger 556

JAK Beholder Rifle kit

Extends the handgun barrel, vastly improving range and recoil control, essentially turning it into a single-shot rifle. The JAK Beholder Rifle kit is compatible with:

  • TYR

JAK Headhunter Carbine Conversion

Extends range and exchanges full-auto fire rate for a three-round burst, so you can take on mid-range fights. The JAK Headhunter Carbine Conversion is compatible with:

  • Rival-9

All Modern Warfare 3 aftermarket parts

Aftermarket parts in Modern Warfare 3 are an additional layer of customization, they are complete conversation kits you can unlock for certain weapons that affect how the weapon performs, looks, and how you can further customize it.

These aftermarket parts are unlocked by ranking the gun to its maximum level. Once the gun has been maxed out, you can transform your weapon into something remarkably different.

Here is every aftermarket conversation in MW3:

MW3 aftermarket parts: a 3d printered conversation kit for a handgun.

Rennetti Handgun with Full-Auto Carbine

The Full-Auto Carbine aftermarket conversion for the Renetti transforms the handgun from a burst first secondary into a fully-equipped SMG. With a 3D printed frame surrounding the base body, the Full-Auto Carbine gives you additional customization options, such as a stock, and an underbarrel attachment.

MW3 Aftermarket Parts: a large LMg with the stock removed.

Pulemyot LMG Jak Annihilator

The bullpup aftermarket conversion kit for the Pulemyot LMG transforms the weapon from a bulky, low-mobility weapon into a much more agile assault rifle. Shortening the barrel and lightening the main body of the LMG allows for a much higher movement speed, ADS speed, and primes the Pulemyot for the smaller MW3 maps like Rust.

MW3 aftermarket parts: an assault rifle with a 3D printed body.

MCW Jak Raven Kit

The Jak Raven Kit for the MCW replaces the gun’s body so it can fire .300 rounds, adding damage to an already formidable weapon. You lost recoil control, and some range, but this aftermarket conversation more than makes up for that with its close-range shredding capability.

MW£ aftermarket parts: an assault rifle with a 3D printed body and a short barrel.

MTZ 762 Jak Heretic Carbine Kit

This conversation for the MTZ 762 increases the rate of fire of the rifle, and the mobility of your operator, at the expense of damage and bullet velocity. One for mid to close-range encounters, this aftermarket part creates a mobile, CQB monster.

MW3 aftermarket parts: a small fully automatic gun with a wooden stock.

WSP 9 Broodmother 45 Kit

The Broodmother 45 kit is an interesting conversion that completely changes the WSP 9, taking it from a fast-firing SMG to a hard-hitting, almost assault rifle-like gun. Fire rate is slowed down but damage has been vastly increased while still maintaining the innate mobility you get from using an SMG.

MW3 aftermarket parts: a gun with a white 3D printed body.

DG 58 LSW Jak Nightshade Rifle Kit

The Jak Nightshade Rifle Kit completely transforms the DG 58 LSW, increasing the rate of fire to almost ludicrous proportions. The recoil control takes a huge hit as a result, but if you can land your shots, you’ll win any gunfight that comes your way.

MW3 aftermarket parts: a very long rifle, in matte black.

MCW 6.8 Full-Auto Conversion

This full auto conversion takes what is already a devastating weapon and turns it up to 11. The recoil control can be a problem, but the fire rate isn’t too heavy, making it manageable. Land a few shots in quick succession with the MCW 6.8 and your enemies will rue the day they crossed your path.

MW3 aftermarket parts: a cylinder shaped handgun.

Cor 45 XRK IP V2 Conversion Kit

While it may look like a ray gun from the future, this conversion kit for the Cor 45 is very real and absolutely devastating. The XRK kit adds an interesting firing mechanic whereby a round is fired when you press the trigger, and then another is loosed when you let go, meaning that you can unleash a barrage with a few clicks that nobody is coming back from.

Those are all of the MW3 aftermarket parts we know of. In the meantime, check out our full list of MW3 guns and pick out your favorite, see which actors have returned with our MW3 cast list, and read up on how the Modern Warfare 3 crossplay system works so you and your buddies can play together.