"Thunderhead" Heavy Autocannon

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"Thunderhead" Heavy Autocannon
GearGraphic AutoCannon.png
Equipment Details
Type Heavy Weapon
Used by Gunner
Slot Primary
Hitscan Yes
Availability Unlock
A peculiar but devastating weapon. The slow rate of fire is made up for by heavy damage, delivered with glee by the belt-fed .50-caliber tungsten rounds. The Thunderhead is a somber weapon for the sophisticated executioner, delivering death as inexorably as the passage of time itself.
~ Item Description

About[edit | edit source]

The "Thunderhead" Heavy Autocannon is an unlockable primary weapon for the Gunner. It is an oversized light machine gun with two massive barrels extending outwards which fire in sequence. The weapon is loaded by a huge ammo box.

The Autocannon fires explosive rounds which detonate upon hitting the world or a target. Enemies hit directly by rounds take both the damage of the bullet and the explosive damage at once. Couple this with an immense magazine size of 110 rounds, and the Autocannon makes for an excellent area control weapon. It starts out with a sluggish fire rate, but this can build up over time the longer the trigger is held.

The Autocannon has several advantages over the Powered Minigun; its most obvious being a lack of overheating. While it is constrained by a magazine size limit, the Autocannon can keep firing for a much longer period than the Minigun can, providing a constant stream of damage to control enemies. Its explosive rounds are much better at destroying armor (especially with upgrades) and it is easier to manage ammo consumption with its lower firing rate.

However, the Autocannon is not without flaws. It has the longest reloading duration of any gun which can reload in the game, lasting an agonizing five seconds, which can cripple a team's presence when the Gunner runs out of ammo. It also has poor accuracy which doesn't improve over time while firing. It also suffers in damage-per-second (DPS) output compared to the Minigun, which can shred through bulky enemies such as Glyphid Praetorians with ease while the Autocannon has to slowly whittle them down.

Considering the Autocannon's flaws, it is a much more defensive weapon than the Minigun, and players must adapt their strategies to compensate. Those who use the Autocannon effectively, however, will find that its excellent staying power and area control abilities make it more than a capable weapon in the right hands.


Icons Campaign.png Unlocked through an assignment.
Requires Gunner Level 10
Purchased for:
Credit.png 7600 Credits
Croppa 80 Croppa
Magnite 120 Magnite
Initial Stats
Damage 14 kinetic
Area Damage 9 Explosive
Magazine Size 110
Max Ammo 440
Reload Time 5s
Movement Speed While Using 50%
Top Rate of Fire (per second) 5.5
Maximum Damage Radius 0.75m
Radius 1.4m
Minimum Damage 50%
Friendly Fire 0%

Modifications[edit | edit source]

There are five tiers and each tier has two to three modifications, only one modification can be equipped per tier.

"Thunderhead" Heavy Autocannon Modifications
Mod Effect Description Price
Tier 1 Icon Upgrade DamageGeneral.png
Increased Caliber Rounds
+3 Damage The good folk in R&D have been busy. The overall damage of your weapon is increased.
Credit.png 1200 Credits
Bismor 25 Bismor
Icon Upgrade ClipSize.png
High Capacity Magazine
+110 Magazine Size The good thing about clips, magazines, ammo drums, fuel tanks ...you can always get bigger variants.
Credit.png 1200 Credits
Enor Pearl 25 Enor Pearl
Icon Upgrade Ammo.png
Expanded Ammo Bags
+220 Max Ammo You had to give up some sandwich-storage, but your total ammo capacity is increased!
Credit.png 1200 Credits
Croppa 25 Croppa
Tier 2
Level 4
Icon Upgrade Aim.png
Tighter Barrel Alignment
x0.7 Base Spread Improved accuracy
Credit.png 2000 Credits
Croppa 24 Croppa
Enor Pearl 15 Enor Pearl
Icon Upgrade FireRate.png
Improved Gas System
+1.5 Top Rate of Fire We overclocked your gun. It fires faster. Don't ask. Just enjoy. Also probably don't tell Management, please.
Credit.png 2000 Credits
Jadiz 24 Jadiz
Enor Pearl 15 Enor Pearl
Icon Upgrade FireRate.png
Lighter Barrel Assembly
+100% Rate of Fire Growth Speed Reach the max rate of fire faster
Credit.png 2000 Credits
Enor Pearl 24 Enor Pearl
Bismor 15 Bismor
Tier 3
Level 8
Icon Upgrade FireRate.png
Supercharged Feed Mechanism
+2 Top Rate of Fire We overclocked your gun. It fires faster. Don't ask. Just enjoy. Also probably don't tell Management, please.
Credit.png 2800 Credits
Croppa 50 Croppa
Jadiz 35 Jadiz
Icon Upgrade Area Damage.png
Loaded Rounds
+2 Area Damage Increased splash damage
Credit.png 2000 Credits
Magnite 35 Magnite
Umanite 50 Umanite
Icon Upgrade DamageGeneral.png
High Velocity Rounds
+4 Damage The good folk in R&D have been busy. The overall damage of your weapon is increased.
Credit.png 2800 Credits
Magnite 50 Magnite
Enor Pearl 35 Enor Pearl
Tier 4
Level 12
Icon Upgrade ArmorBreaking.png
Hardened Rounds
x5 Armor Break Bonus We're proud of this one. Armor shredding. Tear through that high-impact plating of those big buggers like butter. What could be finer?
Credit.png 4800 Credits
Jadiz 72 Jadiz
Magnite 48 Magnite
Enor Pearl 50 Enor Pearl
Icon Upgrade Area.png
Shrapnel Rounds
+0.6m Effect Radius Greater splash damage radius
Credit.png 4800 Credits
Jadiz 72 Jadiz
Magnite 50 Magnite
Umanite 48 Umanite
Tier 5
Level 16
Icon Upgrade DamageGeneral.png
Feedback Loop
+20% Damage at Top Rate of Fire Increased damage when at max rate of fire
Credit.png 5600 Credits
Croppa 140 Croppa
Magnite 64 Magnite
Bismor 70 Bismor
Icon Upgrade ScareEnemies.png
Suppressive Fire
+Impact Fear AoE Chance to scare creatures next to a bullet impact
Credit.png 5600 Credits
Magnite 64 Magnite
Umanite 140 Umanite
Bismor 70 Bismor
Icon Upgrade Resistance.png
Damage Resistance At Full RoF
+33% Damage Resistance at Full Rate of Fire Take significantly less damage when at max rate of fire.
Credit.png 5600 Credits
Croppa 64 Croppa
Jadiz 140 Jadiz
Enor Pearl 70 Enor Pearl

Overclocks[edit | edit source]

"Thunderhead" Heavy Autocannon
Overclock Effect Description Price
Composite Drums

Frame Overclock Clean.png

Icon Upgrade Ammo.png
Pos.svg +110 Max Ammo

Pos.svg -0.5s Reload Time

Lighter weight materials means you can carry even more ammo!
Credit.png 7850 Credits
Croppa 135 Croppa
Magnite 105 Magnite
Enor Pearl 70 Enor Pearl
Splintering Shells

Frame Overclock Clean.png

Icon Upgrade Area.png
Pos.svg +1 Area Damage

Pos.svg +0.3m Effect Radius

Specially designed shells splinter into smaller pieces increasing the splash damage range.
Credit.png 7300 Credits
Croppa 95 Croppa
Jadiz 125 Jadiz
Magnite 65 Magnite
Carpet Bomber

Frame Overclock Balanced.png

Icon Upgrade Area Damage.png
Pos.svg +3 Area Damage
Pos.svg +0.7m Effect Radius

Neg.svg -6 Damage

A few tweaks here and there and the autocannon can now shoot HE rounds! Direct damage is lower but the increased splash damage and range lets you saturate an area like no other weapon can.
Credit.png 7350 Credits
Croppa 120 Croppa
Magnite 105 Magnite
Umanite 70 Umanite
Combat Mobility

Frame Overclock Balanced.png

Icon Upgrade MovementSpeed.png
Pos.svg +15% Movement Speed While Using

Neg.svg -2 Damage

A slight reduction in the power of the rounds permits using a smaller chamber and a light-weight backplate which in turn allows extensive weight redistribution. The end result is a weapon that still packs a punch but is easier to handle on the move.
Credit.png 7650 Credits
Croppa 70 Croppa
Jadiz 120 Jadiz
Magnite 95 Magnite
Big Bertha

Frame Overclock Unstable.png

Icon Upgrade DamageGeneral.png
Pos.svg +12 Damage
Pos.svg x0.7 Base Spread

Neg.svg x0.5 Magazine Size
Neg.svg -110 Max Ammo
Neg.svg -1.5 Top Rate of Fire

Extensive tweaks give a huge bump in raw damage at the cost of ammo capacity and fire rate.
Credit.png 8400 Credits
Croppa 105 Croppa
Umanite 80 Umanite
Bismor 125 Bismor
Neurotoxin Payload

Frame Overclock Unstable.png

Icon Overclock Neuro.png
Pos.svg +Neurotoxin Payload (30% Chance)
Pos.svg +0.3m Effect Radius

Neg.svg -3 Damage
Neg.svg -6 Area Damage

Channel your inner war criminal by mixing some neurotoxin into the explosive compound. The rounds deal less direct damage and splash damage, but affected bugs move slower and take lots of damage over time.
Credit.png 8100 Credits
Croppa 100 Croppa
Jadiz 75 Jadiz
Magnite 135 Magnite


Stats Breakdown[edit | edit source]

Understanding the Weapon[edit | edit source]

  • Damage is how much damage is dealt upon direct impact of the shot.
  • Area Damage is how much damage is dealt in addition to the direct damage within the damage radius around the impact.
  • Top Rate of Fire is the max rate of how quickly shots can be fired after sustained firing.

Rate of Fire Mechanics[edit | edit source]

  • The Autocannon has two hidden stats regarding rate of fire, which is its Starting Rate of Fire and Rate of Fire Scaling. They play an important role in determining how quickly max rate of fire bonuses are applied, and can be changed depending on which modifications/overclocks are taken.
  • Starting Rate of Fire default is 3
    • This determines how quickly shots are initially fired as its rate of fire starts to ramp up.
  • Rate of Fire Scaling default is 0.3
    • This is the coefficient of the exponential function that is used during the rate of fire rampup. The Autocannon's initial rate of fire continues to be scaled until the top rate of fire has been reached, which would then allow max rate of fire bonuses to be applied.
  • Modifications/Overclocks that affect Rate of Fire:
    • Improved Gas System
      • +0.2 Starting Rate of Fire
      • +1.5 Top Rate of Fire
    • Lighter Barrel Assembly
      • +1 Starting Rate of Fire
      • +0.3 Rate of Fire Scaling
    • Supercharged Feeding Mechanism
      • +0.6 Starting Rate of Fire
      • +2.0 Top Rate of Fire
    • Big Bertha
      • -1.5 Top Rate of Fire
  • Rate of Fire Formula
    • Let S be the Starting Rate of Fire
    • Let C be the Rate of Fire Scaling
    • Let M be the Max Rate of Fire
    • Let t represent the amount of seconds that has elapsed since the Fire button has been held down.
    • The Rate of Fire at any given time, t, can be represented as such:
      • \[R(t) = \min(S*e^{Ct}, M)\]
    • Such that when enough time has elapsed and \[S * e ^{Ct} \ge M\], time is no longer a factor in the Rate of Fire. At this point, the "Max Rate of Fire" Bonuses should kick in.
    • Disclaimer: there is a known bug that when T2.C "Lighter Barrel Assembly" is equipped, T3.A "Supercharged Feed Mechanism" is not equipped, and Overclock "Big Bertha" is equipped, the Min Rate of Fire = 4 = Max Rate of Fire and both T5.A and T5.C do not activate properly.

Unique Modifications[edit | edit source]

Suppressive Fire[edit | edit source]

Icon Upgrade ScareEnemies.png

Suppressive Fire inflicts 50% Fear to all enemies within a 1m radius of where bullets impact either enemies or terrain. Most of the small-to-medium creatures will have Fear inflicted on them by this upgrade. It is important to note that the radius of Suppressive Fire does NOT increase with any mods or Overclocks that affect the Damage Radius.


Unique Overclocks[edit | edit source]

Neurotoxin Payload[edit | edit source]

Frame Overclock Unstable.png

Icon Overclock Neuro.png

Neurotoxin Payload is an Unstable Overclock
Each bullet has a 30% chance to apply the Neurotoxin status (12 Poison damage every 0.75 - 1.25 seconds for 10 seconds) to creatures within the bullet's AoE radius.

Mastery[edit | edit source]

Each modification that is purchased advances a mastery bar by one unit.

Mastery unlocks:

  • Three modifications – First Stripe Weapon Paintjob Icon Skin First Stripe.png
  • Seven modifications – Deepcore Weapon Paintjob Icon Skin Deepcore.png
  • All (14) modifications – The Company Special Weapon Paintjob Icon Skin The Company Special.png

Skins[edit | edit source]

Full gallery of skins can be seen at Weapon Skins.

Gallery[edit | edit source]

Trivia[edit | edit source]

  • Mission Control warns the player about the unwieldiness of the Thunderhead upon them receiving its license
  • The weapon deals no friendly fire