What are Modern Warfare 3 Aftermarket Parts and what do they do?

Complete guide to Modern Warfare 3’s 6 Aftermarket Parts with unlock strategies and optimization tips

Introduction to Aftermarket Parts System

Sledgehammer Games introduces Aftermarket Parts as revolutionary weapon conversion systems that fundamentally alter firearm behavior and capabilities within Modern Warfare 3’s extensive arsenal.

As the development studio behind Advanced Warfare and Vanguard, Sledgehammer brings extensive experience creating innovative gameplay mechanics that push franchise boundaries. Their track record includes introducing groundbreaking field upgrades and perk systems that have permanently influenced Call of Duty’s meta-game evolution.

Modern Warfare 3’s weapon ecosystem launches with an unprecedented 114 firearms, including 37 completely new additions. This massive arsenal provides the foundation for Aftermarket Parts to create specialized variants that cater to diverse playstyles and tactical approaches.

These conversion kits represent Sledgehammer’s commitment to weapon customization depth, allowing players to transform standard firearms into highly specialized tools for specific combat roles and situations.

All 6 Aftermarket Parts Detailed Breakdown

Modern Warfare 3 launches with six carefully designed Aftermarket Parts, each requiring specific completion criteria. These conversion systems will expand throughout seasonal content updates, providing ongoing customization opportunities.

• JAK Raven Kit (MCW – AR): This .300 conversion transforms the MCW into an exceptionally versatile platform capable of adapting to virtually any engagement scenario. Its modular design allows for rapid configuration changes mid-match, making it particularly valuable for objective-based modes where combat distances constantly shift. Unlockable through the inaugural weekly challenge following launch.
• JAK Heretic Carbine Kit (MTZ-762 – BR): Engineered for maximum stopping power, this 7.62 battle rifle conversion maintains surprisingly manageable recoil patterns while delivering devastating per-shot damage. Ideal for medium-range engagements where precision and power outweigh fire rate considerations.
• Broodmother .45 Kit (WSP-9 – SMG): Blurring traditional weapon classifications, this conversion kit bridges SMG mobility with assault rifle stopping power through hard-hitting .45 Auto ammunition. The enhanced damage profile makes it exceptionally effective in close-quarters situations while retaining viability at medium distances.
• JAK Annihilator Bullpup Kit (Pulemyot 762 – LMG): Revolutionary bullpup configuration dramatically improves the Pulemyot’s handling characteristics without sacrificing its sustained fire capability. The redesigned weight distribution enables quicker aim-down-sights times and improved strafing mobility, addressing traditional LMG weaknesses.
• XRK IP-V2 Conversion Barrel (COR-45 – Handgun): This carbine conversion fundamentally transforms the COR-45 pistol into a primary-worthy weapon through optics compatibility and underbarrel attachments. The binary fire mechanism effectively doubles rate of fire, creating a unique hybrid between semi-auto precision and full-auto suppression.
• JAK Ferocity Carbine Kit (Renetti – Handgun): Heavy carbine conversion morphs the Renetti into a compact SMG alternative with full attachment customization including optics, stocks, and underbarrel options. The resulting weapon fills a unique niche as an ultra-mobile secondary that can perform primary weapon functions in tight-quarters maps.

Unlock Strategies and Pro Tips

Aftermarket Parts initially become available through time-limited Weekly Challenges that test specific combat proficiencies. Strategic prioritization is crucial since attempting to unlock all six simultaneously spreads focus too thin across different weapon categories and playstyle requirements.

Once seasonal Weekly Challenges expire, these conversion kits transition to the Armory Challenges system, ensuring permanent availability through alternative completion criteria. This design prevents players from missing content due to scheduling conflicts or skill-based barriers in specific challenge types.

Pro Tip: Begin with the JAK Raven Kit as your primary unlock target since its versatility across multiple combat scenarios provides the highest return on time investment. The MCW platform’s inherent flexibility combined with the Raven Kit’s adaptive nature creates a weapon suitable for nearly any map or game mode, making it an ideal foundation for your loadout strategy.

For efficiency, coordinate challenge completion with your natural playstyle strengths. If you excel with LMGs, prioritize the JAK Annihilator Bullpup Kit. SMG specialists should focus on the Broodmother .45 Kit first. This approach minimizes frustration and maximizes progression speed.

Advanced Combat Applications

Mastering Aftermarket Parts requires understanding their nuanced role within broader loadout strategies. These conversion kits excel when paired with complementary perks, equipment, and secondary weapons that amplify their specialized strengths.

Common Mistake to Avoid: Don’t treat converted weapons as direct upgrades to their base versions. Each Aftermarket Part creates a specialized tool with distinct strengths and weaknesses. The JAK Ferocity Carbine Kit transforms the Renetti into an SMG competitor but sacrifices the pistol’s quickdraw advantage and close-range hipfire accuracy.

Game mode optimization is crucial for maximizing Aftermarket Part effectiveness. The XRK IP-V2 Conversion Barrel’s binary fire mechanism shines in fast-paced modes like Hardpoint and Domination where suppression and area denial create tactical advantages. Meanwhile, the JAK Heretic Carbine Kit’s precision damage profile makes it ideal for Search and Destroy where single-shot elimination potential outweighs fire rate considerations.

Advanced players should experiment with attachment combinations that further specialize each conversion kit. The Broodmother .45 Kit benefits dramatically from mobility-enhancing attachments that capitalize on its hybrid nature, while the JAK Annihilator Bullpup Kit pairs exceptionally well with ammunition attachments that extend its sustained fire capability.

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