COD: MW3 FJX Horus Guide - Best Build & Loadout for 6v6 Maps

A Mathematically Optimized build for the FJX Horus on all of your favorite 6v6 maps.

Modern Warfare 3 offers a plethora of attachments, many of which are virtually identical, making the gun-building process quite perplexing. The internet is awash with clickbait and subpar content, but if you seek well-researched, performance-proven class setups from a true Call of Duty expert, you've come to the right place. This guide will explore the optimal loadout and attachments for the FJX Horus on 6v6 maps.

Best FJX Horus Build & Attachments

The FJX Horus SMG has just released for Season 3 of Call of Duty: Modern Warfare 3! As an alternate, fully-automatic version of the COR-45, the FJX Horus is described as “an ultra-compact SMG with best-in-class CQC damage and mobility”. The convenient detail left out of that description is how much recoil it has!

The FJX Horus is decently balanced; it’s neither overpowered nor useless. We’re looking at a 5-shot kill within its 10-meter shred-range clocking in at an excellent 243ms TTK; after that, it’ll drop to a still-good 304ms TTK. From those stats alone, we can tell it fares exceptionally well in close range and is a perfect pick for small maps – but how does it fare at longer ranges?

That’s the balance: Sledgehammer purposefully designed this weapon so that no matter how much recoil reduction you add – even going so far as the JAK BFB with a backup roster of four more recoil-reducing attachments – you’re still going to get a wild, scattered, uncontrollable recoil plot… Unless you know how to build it. Or you were smart enough to look up the best class setup for the FJX Horus and clicked this link. I present, the mathematically optimized™ and possibly only controllable build of the FJX Horus:

My Great Game - My Great Capture_2024-04-04_02-30-53.png

 BaseNew BaseNew
Range10.2 m10.2 mTotal Recoil96.39°80.37°
ADS170 ms235 msFAS / AIS*0 / 0+4 / +1
Sprint to Fire93 ms94 msMovement5.1 m/s4.6 m/s
Strafe3.3 m/s3.2 m/sSprint5.9 m/s5.8 m/s

*Firing Aim Stability & Aiming Idle Sway

One of the biggest factors affecting the weapon’s recoil is not actually recoil – it’s Aiming Idle Sway (henceforth AIS) – the light bob and drift of your weapon as you aim down sights, since your operator can’t hold it perfectly steady like a robot. Not only is AIS turned up to 11 on the FJX Horus, it’s actually unique in that it goes against the conventional way AIS is currently implemented in this game. To quickly summarize: When you ADS, there is a delay before AIS takes effect and starts bobbing and swaying your weapon. With the FJX Horus, there is no such delay; the millisecond you ADS, AIS immediately activates – and it is very strong on this weapon.

By adding so much sway and randomization to the FJX Horus, SHG capped the weapon’s power and strongly reduced its capacity to participate even beyond midrange. Let’s review the attachments:

  • Muzzle: ECS Requieter Suppressor
  • Barrel: Martis Heavy Barrel
  • Optic: JAK Glassless Optic
  • Magazine: 48-Round Magazine
  • Underbarrel: Bruen Heavy Support Grip

The ECS Requieter Suppressor is a unique suppressor available only on the FJX Horus. It keeps us off the minimap, adds Firing Aim Stability, and slightly increases our ADS! Keeping controllable recoil without the use of a compensator muzzle for this gun is quite a feat, so integrating a suppressor is a big deal. It does add a visible laser, but it isn't super high-visibility. The Martis Heavy Barrel adds a seriously impressive amount of Recoil Control and Firing Aim Stability and enables us to use the Bruen Heavy Support Grip, the second-best Underbarrel for reducing horizontal recoil (the brand-new Doorstop Grip takes that place!). While the Doorstop may sound better for the FJX Horus in particular, the Bruen Heavy Support performs a triple role: It provides excellent horizontal mitigation, adds Firing Aim Stability, and adds Aiming Idle Sway – perhaps the 3 biggest problem areas of this gun.

The choice of Optic is the classic JAK Glassless Optic, providing a decent dot-sight while adding Firing Aim Stability. The final attachment is the extended magazine. This build of the FJX Horus retains decent handling times, but strongly reigns in the recoil to manageable and controllable levels without hurting mobility too much.

Thank you for reading! You’re now ready to dominate Season 3’s new content with an excellent build of the FJX Horus! Be sure to also check out our mathematically optimized build of the unique MORS right here on Fanbyte, as well as highly-tested, performance-proven mathematically optimized builds for every other SMG!

Our Testing Process: What does "Mathematically Optimized" mean? 

It means that I have personally conducted over 30 hours of dedicated testing across the entire MW2 & 3 attachment set, endlessly consulted high-quality external resources and databases, and tirelessly tested performance across separate attachment combinations to produce what I believe to be the optimal build of a weapon for a specific purpose. Weapons are carefully crafted considering every possible detail - attempting to deliver the mathematically best possible performance in every category - mobility, handling, recoil, range, and accuracy.

With my builds, I believe you should see creative, never-before-seen uses of attachments that create incredible weapons. Do keep in mind that these weapons will not do the work for you - while they have all been precision-crafted to reduce horizontal recoil as much as possible, some of them still have quite noticeable vertical recoil, and it is on you to manage that vertical recoil correctly. I sincerely hope you enjoy reading about this build and every other build I have to offer on Fanbyte!

DISCLAIMER: If you test these in the Firing Range, please note that the Firing Range is currently glitched and shows more visual recoil and different damage performance than actually experienced in-game; it is best that you test these in a custom match or online.

About the Author

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XVI the Great

Call of Duty stats & attachment wizard. I make high-effort, high-quality text guides for Fanbyte. One of five players on the entire planet to reach level 1,000 every season of Black Ops Cold War & Vanguard. Passionate about all things CoD and dedicated to transforming my extensive gameplay experience into resources to help the Call of Duty community.