Helldivers 2 Sway: Why Your Gun Feels Worse Upgraded

The broken sway bar

The customization screen displays a sway indicator, but it does not move when you equip attachments. Arrowhead left it untouched for nearly two years, so players had no feedback about whether a part helped or hurt. Sway governs aim stability and, by extension, how controllable the weapon is under fire.

What the datamine shows

Community datamining of the game files surfaced the real percentages behind attachments:

• Angled Foregrip — reduces sway by 25 percent. This is the rare attachment that genuinely improves handling.
• Compensator — increases sway by 35 percent.
• Muzzle Brake — increases sway by 20 percent.
• Flash Hider — increases sway by 10 percent. So almost every muzzle attachment makes the gun harder to control, while the foregrip is the one that helps. A player who stacks a compensator expecting stability actually made the weapon worse — exactly the trap the broken UI hid.

Practical build advice

If handling matters to you, the Angled Foregrip is usually the safe pick, and you should think twice before adding a muzzle part unless you want its other effect (like the compensator’s recoil profile) enough to pay the sway cost. These numbers live in the hidden layer described on the hidden weapon stats page, which is why the game never showed them — but now you know. If you are choosing a primary around these tradeoffs, the durable damage page is the better place to start, since damage type matters more than sway for most fights.