GP-20 Ultimatum – Helldivers 2 Weapon Review and Guide

The GP-20 Ultimatum stands as one of the most destructive secondary weapons in Helldivers 2, a true embodiment of “high risk, high reward.” This compact yet devastating launcher fires an 80 mm explosive shell capable of annihilating nearly any target within its 12-meter blast radius—but with only one round in the chamber and a single spare in reserve, precision and timing are everything.

Weapon Overview

Strengths

• Massive Destructive Power: The Ultimatum can destroy almost any non-boss target in a single hit and level enemy structures—Bug Holes, Fabricators, and Warp Ships—with ease.
• Anti-Armor Capability: Its Anti-Tank II penetration and 2,000 explosion damage make it one of the few handheld weapons that can reliably eliminate heavy units or armor plating.
• Demolition Utility: With a demolition force of 40 and shockwave radius of 25 m, it's ideal for clearing objectives or suppressing fortified points.
• Ammo Efficiency (Situational): Although capacity is low, each ammo box restores a full shot, meaning one crate effectively doubles your total ammo.

Weaknesses

• Extremely Limited Ammo: Only two shots total—one in the chamber and one spare—makes it unreliable for extended engagements.
• Short Effective Range: The grenade's drop and slow velocity (~20 m/s) limit practical use to close range. Even at a 45° arc, range barely reaches 40–45 m.
• Self-Damage Hazard: The 12-meter blast radius often overlaps with its own range. Firing too close can result in instant death.
• No Reliable Backup: Equipping this weapon removes access to a standard pistol or machine sidearm, leaving you vulnerable if your primary runs dry.
• High Skill Requirement: Requires mastery of positioning, timing, and awareness—ideal for advanced players comfortable with risk management.

Tactical Usage and Build Guide

Best Role: 
Destruction Specialist or Support for anti-structure operations. Works excellently when paired with a defensive or high-mobility primary loadout.

Recommended Builds:

Primary Weapon: Breaker Shotgun / APW-1 Anti-Materiel Rifle

Armor: Medium or Heavy Armor with Explosive Resistance

Stratagems:

• Supply Pack – Essential for sustaining ammo
• EAT-17 / Recoilless Rifle – Complements its anti-armor role
• Jump Pack / Shield Generator / Guard Dog Rover – Offsets mobility or defense gaps

Tactics:

• Fire from cover or high ground to avoid self-damage.
• Time shots for clustered enemies or key objectives.
• Use terrain elevation or forward dive momentum to extend range.
• Coordinate with teammates—your single blast can change the tide if used smartly.

For players looking to master this weapon quickly, pairing it with a well-balanced loadout and consistent supply support is key. If you want to unlock the GP-20 Ultimatum without grinding through missions, you can easily boost your progress by getting Helldivers 2 Medals instant delivery, helping you access high-tier Warbond gear faster and focus on refining your battlefield tactics.

Player Reviews and Meta Insight

The Helldivers 2 community views the GP-20 Ultimatum as a glass cannon's dream. Players praise its absurd damage output and ability to one-shot everything smaller than a Factory Strider, but many call it a “specialist's toy”—a situational weapon meant for specific missions or co-op coordination rather than general loadouts.

Pros (from player feedback):

• “Deletes objectives instantly.”
• “Perfect for structure clearing or clutch anti-tank shots.”
• “Incredible satisfaction when used correctly.”

Cons:

• “Suicidal blast radius.”
• “Terrible ammo economy.”
• “Basically a two-shot nuke—make them count.”

Most veterans agree: the Ultimatum isn't a casual weapon—it's a precision demolition tool for players who understand when not to shoot.

The GP-20 Ultimatum embodies Helldivers 2's chaotic beauty—unmatched destructive potential balanced by lethal self-risk. It's not for everyone, but in capable hands, it turns the battlefield into molten debris. Use it wisely, plan your loadout around its limits, and you'll command the kind of power that defines a true Helldiver.