Ultimatum Helldivers 2 — GP-20 Guide, Stats & One-Shot Builds

The GP-20 Ultimatum is a pocket anti-tank launcher that squeezes into your secondary slot: 3,000 total damage (1,000 ballistic + 2,000 explosive) with Anti-Tank II penetration, capable of one-shotting Hulks, Tanks and Bile Titans and destroying Fabricators and Bug Holes from the outside. It's a two-shot weapon (one in the chamber, one spare) from page 2 of the Servants of Freedom Warbond for 40 Medals, and its entire personality is a trade: absurd destructive power for a comically short range (~17m flat, ~40m at a 45° arc) and a blast radius that will kill you if you fire from too close.

This guide covers how to unlock it, the exact stats, why the projectile behaves the way it does, the targets it one-shots per faction, and the loadouts that make a two-shot secondary work.

Official resources: Steam store page · Helldivers Wiki (wiki.gg) — GP-20 Ultimatum · GameRant — S-Tier Secondaries · GamesRadar+ — Secondary Weapon Tier List · IGN — Helldivers 2 wiki

What Is the Ultimatum?

The Ultimatum is a Secondary Weapon (Special type) that fires an 80mm explosive shell — think of it as the GP-31 Grenade Pistol's bigger, angrier sibling. It has the One Handed and Explosive traits, meaning you can carry objectives while holding it, and every shot is a small artillery strike.

Note on the naming: some older articles call it the "GP-31 Ultimatum," but the official wiki and the game's files identify it as GP-20 Ultimatum (the GP-31 is the Grenade Pistol). If you see the GP-31 number attached to the Ultimatum, it's a typo that's been floating around the web since launch.

Official source: Helldivers Wiki (wiki.gg) — GP-20 Ultimatum — "The Ultimatum is a Secondary Special, powerful single-shot weapon that fires extremely destructive explosive rounds... The Ultimatum is capable of killing most enemies in a single shot."

The wiki's projectile data explains the short range: the shell is a 500g projectile at 20 m/s with full gravity and 50% drag. It lobs like a mortar round — and your movement velocity transfers to it, which is the single most important trick to learn (below).

How to Unlock the Ultimatum

1. Buy the Servants of Freedom Premium Warbond (1,000 Super Credits — or farm them free with the Trivial Run method).
2. Unlock page 2 by spending Medals on page 1.
3. Spend 40 Medals on the GP-20 Ultimatum.

Servants of Freedom also contains the Double Edge Sickle (35 Medals, page 1) and the Integrated Explosives armor — it's one of the best-value Warbonds in the game.

What Can the Ultimatum One-Shot? (Per Faction)

The Ultimatum's selling point is the "delete button" list:

• Terminids: everything up to and including Chargers (direct hit) and Bile Titans (single hit). Spore Towers, Shrieker Nests, Purge Hatcheries and Bile Titan Bug Holes all die to one shot from outside.
• Automatons: one-shots Striders, Devastators, Gunships, Berserkers, and on direct hits Hulks, Tanks and Defense Towers. Factory Striders take multiple hits (aim for the underbelly). Command Bunkers, Fabricators and Airbases all go down in one shot.
• Illuminate: one-shots Voteless crowds, Overseers and shielded Harvesters, and destroys grounded Warp Ships from the outside (they take bonus explosive damage).

For structures, the demolition force of 40 is the magic number: it means the Ultimatum can close Bug Holes and destroy Fabricators without a grenade or stratagem — a secondary weapon that does what your support slot usually does.

Why the Range Is So Short (and How to Extend It)

The 20 m/s shell with full gravity gives the Ultimatum its signature lob, and the wiki documents the quirks:

• Standing still, flat shot: ~17m range.
• 45° arc: ~40m.
• Your velocity transfers to the shell: diving forward, using a Jump Pack, riding in an FRV, or using the Raise Weapon emote all extend the range significantly. The diving throw is the community's go-to range extension — dive toward the target as you fire and the shell carries the momentum.
• Ammo boxes disproportionately benefit it: one ammo box refills the entire reserve, so you can effectively top up to 2 shots from any crate.

Best Loadouts for the Ultimatum

The objective-destroyer build (the meta use):

• Any medium-penetration primary — the Purifier or Exploding Crossbow cover infantry while the Ultimatum handles structures and heavies
• Ultimatum in the secondary slot
• Recoilless Rifle or Quasar Cannon as the support weapon (for the really big targets and dropships)
• Supply Pack or a sentry for defense

The anti-tank specialist:

• Ultimatum + Thermite grenades (5 with Engineering Kit armor) + the 500kg + Orbital Railcannon — four independent anti-tank tools that never share cooldowns

The Grenadier build:

• Engineering Kit armor (+2 throwables), grenade-heavy primary, Ultimatum for anything the grenades can't reach

GameRant makes the case that the Ultimatum is the only true S-tier secondary — not for killing players, but because it does mission-critical work (destroying objectives) that no other secondary can touch. The best weapons guide ranks it against the Senator and the rest of the sidearm field.

Ultimatum Mistakes (and the Fixes)

• Firing at a moving target at max range — the shell is slow; lead heavily or wait for the target to stop.
• Point-blank panic shots — you will die. The 12m radius doesn't care about your armor.
• Forgetting the dive — the momentum trick turns a 17m weapon into a 40m one; practice the dive-fire in a trivial mission first.
• Wasting it on chaff — a single Scavenger doesn't need 3,000 damage; that shot is your Hulk delete.
• Not treating the reload as a reload — every shot is followed by a manual reload animation; you're vulnerable during it, so fire from cover or behind a sentry.

Frequently Asked Questions

What is the Ultimatum in Helldivers 2?

The GP-20 Ultimatum is a secondary weapon from the Servants of Freedom Warbond that fires a single 3,000-damage anti-tank explosive shell. It has Anti-Tank II penetration and a demolition force of 40, letting it destroy structures and one-shot most heavies — at very short range.

How do you get the Ultimatum in Helldivers 2?

Buy the Servants of Freedom Premium Warbond (1,000 Super Credits), progress to page 2, and spend 40 Medals. It's a permanent secondary weapon unlock.

How much damage does the Ultimatum do?

3,000 total damage per shot — 1,000 ballistic projectile damage plus 2,000 explosive damage, with a 12m blast radius (25m shockwave). It one-shots Bile Titans, Hulks and Tanks on direct hits and destroys Fabricators, Bug Holes and Warp Ships.

Why does the Ultimatum have such short range?

Its 500g shell travels at only 20 m/s with full gravity — about 17m flat, 40m at a 45° arc. Your movement velocity transfers to the shell, so diving forward or using a Jump Pack extends the range significantly.

What is the best build for the Ultimatum?

Pair it with a medium-penetration primary (Purifier, Exploding Crossbow), an anti-tank support weapon for the biggest targets, and Engineering Kit armor for extra grenades. Use it as a planned objective/heavy destroyer, never as a panic weapon.

Related Guides

• Helldivers 2 Best Weapons — 2026 Tier List and Meta Guide
• 500 kg Bomb Helldivers 2 — Code, Damage & Best Uses
• Helldivers 2 Tank Guide — Bastion, Shredder Tank & How to Destroy Them
• Hive Lord Helldivers 2 — How to Find and Kill the 150,000 HP Boss
• Helldivers 2 Armor Guide — Stats, Passives & Best Armor
• Super Credit Farm Helldivers 2 — The Trivial Run Method

Last updated: August 13, 2026.