Ammo Capacity

Ammo Capacity
Attributes
Type	Weapon Stat
Description	Hidden stat determining total ammunition reserves

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Ammo Capacity (also known as Inventory Size) is a hidden stat in Destiny 2 that determines the maximum amount of ammunition a weapon can carry in reserve.

Overview

Ammo Capacity is a crucial but often overlooked weapon statistic that affects how much total ammunition a Guardian can carry for each weapon. Unlike visible stats such as Range or Stability, Ammo Capacity operates behind the scenes but significantly impacts gameplay, especially in endgame activities.

Mechanics

Inventory Size Stat

Hidden value on all weapons
Viewable through API tools like Destiny Item Manager
Determines maximum reserve ammunition
Separate from magazine size
Affects ammo pickup amounts

Calculation

Total ammunition = Magazine Size + Reserve Capacity

Reserve Capacity determined by Inventory Size stat
Can be modified through various methods
Weapon type influences base values

Base Values by Weapon Type

Primary Weapons

Generally high reserve capacity
Infinite ammo in PvE (post-update)
Still affected by capacity in PvP

Special Weapons

Shotguns: 15-20 rounds base
Sniper Rifles: 15-25 rounds base
Fusion Rifles: 15-20 rounds base
Trace Rifles: Variable based on archetype

Heavy Weapons

Rocket Launchers: 5-7 rockets base
Machine Guns: 150-250 rounds base
Swords: 40-60 ammo base
Linear Fusion Rifles: 15-20 rounds base

Modifying Ammo Capacity

Reserve Mods

Chest armor mods that increase capacity:

Elemental Reserves (Arc, Solar, Void, Stasis, Strand)

 * 1 mod: +20 Inventory Size
 * 2 mods: +40 Inventory Size
 * 3 mods: +50 Inventory Size

Harmonic Reserves: Matches subclass element
Energy cost: 2 (reduced from 3)

Weapon Perks

Field Prep: Increases reserve ammo
Ambitious Assassin: Overflows magazine
Overflow: Loads from reserves
Backup Mag: Increases magazine (indirectly affects total)

Intrinsic Traits

Some weapons have built-in capacity bonuses:

Exotic weapons with unique reserves
Certain legendary archetypes
Raid/Trials weapons with enhanced stats

Practical Applications

PvE Benefits

Extended damage phases without ammo runs
Better ammunition economy
Reduced downtime searching for ammo
Critical for solo content

PvP Considerations

More special ammo per life
Better heavy ammo efficiency
Tactical advantage in Trials
Survival game mode benefits

Recent Changes

Update 8.0.5

Reserve ammunition increased by up to 15%
Low-reserve weapons received larger buffs
Reserve mod costs reduced by 1 energy
Fixed mod-swapping exploit

General Updates

Primary ammo made infinite in PvE
Special ammo economy adjustments
Heavy ammo drop rates modified
Scavenger mod interactions updated

Interaction with Other Systems

Scavenger Mods

Higher reserves = more ammo per pickup
Synergizes with Reserve mods
Affects ammo brick values
Important for ammo economy

Rally Flags

Fill weapons to maximum capacity
Useful for testing reserve limits
Standard in raids and dungeons

Ammo Finders

Generate ammo bricks
Work independently of capacity
Complement reserve builds

Build Considerations

High-Reserve Builds

Stack matching Reserve mods
Use Field Prep when available
Consider weapon archetypes
Balance with other chest mods

Ammo Economy Builds

Combine Finders, Scavengers, Reserves
Focus on ammunition sustainability
Critical for solo/GM content
Weapon-specific optimizations

Known Issues

Some Reserve mods bugged with swords
API values may not reflect in-game
Certain exotics have unusual scaling
Visual indicators sometimes incorrect

Tips

Check inventory size before modding
Low-reserve weapons benefit most
Consider activity type when building
Test configurations at rally flags

References