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The 2mm electromagnetic cartridge is a type of ammunition for use in weapons in Fallout 4.


This section is transcluded from 2mm EC. To change it, please edit the transcluded page.

Designed specifically for use in Gauss weaponry, 2mm electromagnetic cartridges come pre-packaged with ferromagnetic projectiles and a battery pack to power the accelerator coils which create the electromagnetic field.[1][Non-canon 1]


Much like in Fallout 2, 2mm EC rounds are used by the incredibly powerful Gauss rifle. These rounds are exceptionally rare and expensive and also take the most resources to craft.


Copper (3)
Lead (2)
Oil (1)
2mm EC (10)

Weapons using this ammunition


  • One cartridge can be found on a tray on a counter in the stowage depot of the Prydwen. This is the only placed instance of a 2mm EC cartridge in the game.
  • 2mm EC ammo may also be found in rare loot from level 22 onwards, or found along with randomly spawned Gauss rifles.
  • These vendors sell approximately 20-55 of the rare 2mm EC ammo type, refreshing their stock every 48 hours. The ammo does not become available from vendors until level 28 (or possibly level 22 in some cases), increasing in quantity at levels 30 and 35.
Vendor Name Vendor Location
Arturo Rodriguez Diamond City market
Myrna Diamond City market
Percy Diamond City market
Daisy Goodneighbor
KL-E-0 Goodneighbor
Rufus Rubins Goodneighbor
Proctor Teagan The Prydwen
Tinker Tom Railroad HQ
Cricket Boston
(Traveling merchant)
Ronnie Shaw The Castle
(after completing Old Guns)


  • 2mm EC rounds are extremely hard to find in containers at lower levels, so much so that even with investment in the Scrounger perk it is possible that even by level 25-30 the Sole Survivor might only find a single stash of these rounds. They are more commonly found after level 30.
  • The stores that sell 2mm EC rounds are sold in very low amounts along with being very expensive. They will replenish their stock after 48 hours, however.
  • To gain large quantities of 2mm EC ammo fast, one may go to Diamond City market, buy out all vendors' ammo, then wait 48 hours on any local chair (bar stool, barbershop's sofa, etc.) in order to replenish the vendors' ammo stock.


  1. "Praised for its range and stopping power, the PPK12 Gauss Pistol is of German design. The pistol uses an electromagnetic field to propel rounds at tremendous speed and punch through almost any armor."
    (Fallout 2 item description)
  1. Fallout: The Roleplaying Game Rulebook; p.94:
    "The 2mm Electromagnetic Cartridge is a self-contained magazine containing high-velocity ferromagnetic projectiles and the battery pack necessary to power the gaussIn-game spelling, punctuation and/or grammar weapon they are fired from.
    This ammunition is not found loose, but in magazines containing the number of shots generated (and sufficient battery charge to power the weapon for those shots)."