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Best ISO Warzone loadout

Does even the best ISO loadout hold a candle to the MP7 or MP5?

If you want tips to get your ideal ISO set up, then look no further. The ISO was one of three new weapons added to Warzone in Season 5, and it took a bit of time to find its place in the current SMG meta. Our Warzone ISO guide looks to sort things out once and for all, both by providing you with the best possible post-patch ISO loadout that we've found so far, and also taking a look at the gun's base stats and seeing how it compares with other SMGs in Verdansk and Rebirth Island.

Best ISO Warzone loadout

Let's jump right into this guide with an explanation of the very best ISO Warzone loadout we've found so far:

  • Barrel: FSS Nightshade
  • Underbarrel: Merc Foregrip
  • Ammunition: 50 Round Mags
  • Laser: Tac Laser
  • Perk: Sleight of Hand
  • Rear Grip: No change
  • Stock: No changes
  • Optic: No changes
  • Muzzle: No changes

Here you can see what the ISO looks like with this loadout equipped:

This is what the ISO looks like with our best loadout. The ironsights are good enough at close range that you don't need an optic attachment.

The focus of this loadout is to leverage the main selling points of the ISO. This is pretty tricky, because as things currently stand, the gun is a little bit worse than the major SMGs in almost every way. But there are two interesting points about the ISO which we're taking advantage of in this loadout: the integrated suppressor (the FSS Nightshade), and the extremely fast reload speed.

The Nightshade barrel is actually very good on the ISO, increasing the gun's effective range by almost 50%, and quite significantly tightening up the recoil, as you can see from the below comparison:

A side-by-side comparison of the recoil of the ISO in its base form, and with our best ISO loadout equipped.

But the other great thing about the Nightshade is that it acts as both barrel and suppressor, freeing up an attachment slot for us to pick up the Sleight of Hand perk. With SoH, the ISO's reload speed drops to a scant 0.78 seconds, making it the fastest reload time of any primary weapon in Warzone. I've surprised and beaten more than a few enemies in Warzone with this extraordinary reload speed.

Then we've added the Merc Foregrip, our favourite underbarrel for SMGs thanks to its surprising handling benefits and further recoil control; and then the Tac Laser, to compensate for the loss in ADS speed brought on by the Nightshade and Merc Foregrip.

And finally, the magazine. 20 rounds is simply not good enough in Warzone, so we'll absolutely need either the 30 Round Mags or the 50 Round Drums. Before the latest patch, the 50 Round Mags was far too slowing to use, but now it's perfectly tolerable - and the higher your mag size in Warzone, the better.

And there you have it: a powerful SMG with a decent magazine capacity, very controllable spray pattern, and unbelievably quick reload time. Take it for a spin in a Warzone match and see how you fare.


Hopefully now you've a solid grasp of the ISO and how to make it as powerful as it can be with the right loadout in Warzone. But in case you're still hungering for tips and stats, check out our guides to the best FiNN loadout and the our favourite Warzone perks.

About the Author

Ollie Toms avatar

Ollie Toms

Guides Editor

Ollie is known round these parts for having just about the deepest voice in existence. Some say he used to be pretty darn good at Rocket League, but he has since sacrificed that accolade in order to become passably decent at Apex Legends. His favourite pastimes include playing piano covers of his favourite game soundtracks, and burying his face in the warm fur of his two cats.

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