In the last few Call of Duty games, progression and personalization has been defined by the Gunsmith system. This system allows players to customize their weapons with tons of unique parts, to improve their weapons or convert them into new ones entirely. I love to do the latter, as seen on our “Strangely Smithed” series on YouTube and TikTok.

In Modern Warfare 3, players will have more options than ever to customize their weapons. The centerpiece of Gunsmith this time around is Aftermarket Parts. These parts – inspired by real world firearm customization – allow players to fundamentally alter the functionality of their weapons in MW3. Better yet, it only takes one attachment slot to do so.

How do I unlock Aftermarket Parts?

A look at the Weekly Challenge Menu from the Official Call of Duty Blog.

Aftermarket Parts are unlocked as part of the Weekly Challenges feature in MW3. New Aftermarket Parts will be added both in the pre-season at Launch, and in subsequent Seasons. As you can see from the image above, to unlock the JAK Raven Kit you need to complete any 5 Challenges from Week 1. There are several weekly challenges in both Multiplayer and Zombies, so you will have plenty of options to choose the unlock path that works best for you. Also note that these challenges do not have to be completed in the week they are assigned. For example, you will still be able to unlock the Week 1 Aftermarket Part if you get the game for Christmas in Week 7.

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What Aftermarket Parts are Available in the Preseason in MW3?

First up, is the aforementioned Jak Raven Kit. This conversion kit is an Aftermarket Part for the MCW (aka ACR) which makes it a compact, adaptable rifle which shoots .300 Rounds. To me, this conversion greatly resembles the iconic Kilo 141 from the early days of Warzone.

Jak Heretic Carbine Kit

This Aftermarket Part for the MTZ-762 Battle Rifle converts it to a Carbine which fires powerful .762 Ammo. It’s described as pairing “exceptional damage with moderate recoil”.

Broodmother .45 Kit

This conversion kit for the WSP-9 gives the weapon a higher caliber ammunition that allows the weapon to function as a cross between an SMG and an AR. It shoots .45 Auto rounds for a hard-hitting fully automatic weapon in a small, maneuverable package.

JAK Annihilator Bullpup Kit

This conversion kit for the Pulemyot 762 was first seen in the MW3 Beta. This conversion makes the weapon more compact and maneuverable. It still keeps all the advantages of an LMG chambered in .762 rounds.

XRK IP-V2 Conversion Barrel

This barrel might look familiar to fans of last year’s Modern Warfare 2, as it greatly resembles an attachment for the X13 in that game. This conversion kit for the COR-45 allows this Glock-like handgun – chambered in .45 Auto – to take underbarrel and optic attachments. It also comes with a binary trigger. This trigger keeps the weapon in semi-automatic, but shoots a round out the chamber when the trigger is pulled and released; effectively doubling your fire rate. This will make for a a valuable, modular secondary.

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JAK Ferocity Carbine Kit 

Last but not least, this conversion kit for the Renetti Handgun coverts it into a full auto SMG. You will be able to add underbarrels, optics, and stocks to this weapon for a highly modular CQC weapon that can sit comfortably in your secondary slot. Expect it to make for a great Sniper-Support weapon, especially in the next iteration of Warzone.

To see these builds in action, check out the Video version on YouTube. Stick with us here for more Call of Duty Guides leading into and through launch.

Call of Duty: Modern Warfare 3 is available from November 10th on PC, PS4, PS5, Xbox One and Xbox Series X|S.

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