Heavy Caliber increases damage of Primary Weapons (excluding Shotguns) at the cost of reduced accuracy by 15% and -5% per rank, at a maximum of 165% and -55% at rank 10, respectively.


Rank Damage Accuracy Cost
0 +15% -5% 6
1 +30% -10% 7
2 +45% -15% 8
3 +60% -20% 9
4 +75% -25% 10
5 +90% -30% 11
6 +105% -35% 12
7 +120% -40% 13
8 +135% -45% 14
9 +150% -50% 15
10 +165% -55% 16


  • In comparison to Serration, Heavy Caliber costs two more mod power for the same damage buff despite the accuracy reduction.
  • Instead of reducing the accuracy by 5% per rank, each rank increases spread by a specific percent per rank depending on the weapon. This effectively reduces accuracy, but may reduce it by greater than 5% per rank (according to the Arsenal UI).
  • Damage increase of Heavy Caliber stacks additively with that of Serration. With Serration and Heavy Caliber both maxed, you can reach +330% base damage in total, before adding Elemental and Faction based damage mods.
    • Since the two stack additively and Heavy Caliber costs 2 more mod capacity for the same bonus, combining the two is slightly less efficient in terms of damage per capacity cost. Maxed Serration grants +11.79% bonus damage per 1 mod capacity, while maxed Heavy Caliber grants +10.31% bonus damage per mod capacity. Combining the two, Serration and Heavy Caliber grant +11% bonus damage per 1 mod capacity, which is +0.79% less bonus damage per capacity than Serration alone.
    • The bonus damage from using Heavy Caliber with Serration is double that of using Serration by itself, though it comes at the cost of an additional mod slot and Heavy Caliber's slightly higher "base" drain of 6.
      • For example, if base damage is 100 then Serration adds 165% bonus damage and Heavy Caliber adds an additional 165% bonus damage, for a total of 430 damage. Thus, bonus damage is doubled for roughly double (+114%) the drain cost.
  • Accuracy will suffer on weapons without 100% accuracy, affecting the actual bullet path. This makes even accurate guns like the Soma spread bullets considerably at maximum rank.
  • Guided Ordnance can counter the accuracy reduction.
  • The following weapons below are unaffected or barely affected by the accuracy penalty:




Patch HistoryEdit

Update 20.0
  • Fixed the Ferrox not being affected by Heavy Caliber.

Hotfix 19.4.1

  • Fixed extra stat appended to end of Heavy Caliber description.

Update 14.5

  • Fixed Mirage’s Hall of Mirrors not being affected by some mods (Heavy Caliber).

Hotfix 14.1.4

  • Fixed an issue with certain Mods (i.e Heavy Caliber) not working correctly with Hall of Mirror clones.

Update 12.3

  • Weapon and Mod conclave tweaks – increased the rating on the Heavy Caliber mod.

Update 10.5

  • Corrupted Heavy Caliber mod now works with Acrid.

Update 10.4

  • Recoil penalty changed to accuracy penalty.

Update 10.3

  • Introduced along with Orokin Vaults.

See alsoEdit

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