Aftermarket Parts in Call of Duty: What Does It Mean?

Aftermarket Parts are special weapon attachments in Call of Duty: Modern Warfare III that go beyond normal Gunsmith upgrades. Some are unique attachments like an underbarrel flamethrower. Others are full Conversion Kits that change what a weapon is, for example turning a pistol into a submachine gun. They are unlocked through weekly and Armory challenges rather than weapon levels.

How It Works

According to the Call of Duty Wiki, Aftermarket Parts can be unlocked through Weekly Challenges or Armory Unlocks in Multiplayer, Zombies and Warzone. In Warzone Mobile they could instead be bought in the Arsenal Store.

• Weekly Challenges. During a season, new parts were tied to a given week's challenges. The JAK Outlaw-277 Kit, for example, required any five Season 2 Week 7 challenges, which could be picked from the Multiplayer, Zombies and Warzone lists.
• Armory Unlocks. Parts that were not earned before the season ended moved to the Armory, where they could be unlocked through a different set of requirements.

A Conversion Kit takes one attachment slot but often blocks others, because it physically changes the weapon. That is why equipping one can lock you out of certain barrels, magazines or stocks.

Examples

Some well-known Modern Warfare III parts, with their effects as described on the wiki:

• JAK Ferocity Carbine Kit (Renetti): converts the Renetti pistol into a compact SMG that accepts optics, stocks and underbarrels.
• JAK Raven Kit (MCW): a .300 caliber conversion of the MCW rifle.
• JAK Annihilator Bullpup Kit (Pulemyot 762): turns the LMG into a compact bullpup for better handling.
• JAK Tyrant 762 Kit (Longbow): swaps the sniper's receiver and magazine to fire 7.62 BLK subsonic ammunition for harder hits.
• JAK Outlaw-277 Kit (BAS-B): turns the battle rifle into a lever-action rifle with a slower fire rate but better accuracy.
• JAK Purifier and JAK Limb Ripper: underbarrel attachments for supported rifles that add a flamethrower and a chainsaw, respectively.
• JAK BFB: a compensator that sharply reduces recoil but makes your shots much louder and puts you on the enemy radar when you fire.
• JAK Glassless Optic: a reflex sight with stabilization that reduces visual recoil.

In Newer Call of Duty Games

"Aftermarket Parts" is Modern Warfare III's name for the system. Black Ops 7 uses a similar idea with weapon conversion kits, also earned through weekly challenges. The MXR-17 ANVL kit, which turns the MXR-17 assault rifle into the HAMR LMG from Black Ops 2, required any six Season 2 Week 7 challenges and occupies the barrel and magazine slots. Requirements differ from kit to kit and season to season, so always check the challenge text in game.

Tips

1. Check the weekly challenges early. Parts are easiest to get during the season they launch in. After that, you depend on the Armory.
2. Read the attachment restrictions. Before you build around a kit, check which slots it blocks so your favorite attachments still fit.
3. Compare stats, not hype. A conversion trades some stats for others, and a well-tuned standard build can still be better for your play style.
4. Pick challenges from your best mode. When a part's challenges are offered in several modes, finish the ones from the mode you play best.

FAQ

Are Aftermarket Parts the same as normal attachments?

They sit in the Gunsmith like attachments, but they are unlocked through challenges and can change a weapon's caliber, fire mode or class.

Can I still get an Aftermarket Part after its season ends?

In Modern Warfare III, yes. Missed parts moved to the Armory Unlocks system with their own requirements.

Do Aftermarket Parts work in Warzone?

Modern Warfare III parts could be unlocked and used in Warzone as well, according to the wiki. Check the current season, since weapon pools change.

Season details are published on the official Call of Duty site.