For the uncommon version, see Charged Chamber.

Primed Chamber is a sniper rifle mod that increases the damage from the first shot fired from a fresh magazine.


Rank Effect Cost
0 +25% 4
1 +50% 5
2 +75% 6
3 +100% 7


  • This was originally distributed to the top 100 ranked players in the Informant Event, based on the number of Informer kills.
  • For a short time after Update 10.6 it could have been acquired via transmutation. This was due to a bug where all mods (including unreleased ones) became obtainable through transmutation. This has since been fixed, but players who obtained the mod this way were allowed to keep them.
  • During Devstream 17, 18, 43, 49, 59 and 94 one lucky winner was given a Primed Chamber mod through random selection. It is unknown if they will continue giving away Primed Chamber this way.
  • A single Primed Chamber was given out as the first place reward for the Mirror the Mod Contest.
  • A Primed Chamber was given out upon reaching $4,000.00 during the WarframeFanChannels Extra-Life event in February 2017.
  • The option of being given either a Primed Chamber or a Legendary Core was given by DESheldon at Tennocon 2017 to five people who caught MTG cards he threw out into the audience. He later signed these cards as proof of the prize.

DERebecca has stated the following on the topic of people being upset over Primed Chamber being exclusive: "Ah, we did not say the Primed Chamber mod is Exclusive to the Drone weekend event, it was just the first time it was introduced. Sorry for the confusion there! I imagine it will appear again in future events." [1]

Due to the release of Charged Chamber it seems unlikely that Primed Chamber will be released as a drop however the possibility of Primed Chamber appearing in another event has been confirmed in livestream 17.  DE said they were going to have it as a Gradivus Dilemma reward, but "didn't get that far" and are looking for the next appropriate event to add it to.


  • This mod goes particularly well with the Vectis as it has a one shot magazine, giving the bonus to all shots fired.


  • Formula for damage calculation:
    • Total damage = (Base damage) * (1 + Damage %)
    • For example, a Rubico installed with a fully ranked Serration deals 530 damage. With a fully ranked Primed Chamber you would have:
      530 * (1 + 1) = 1,060 total damage on the first shot.
  • Stacks additively with Charged Chamber for up to 140% bonus damage.

Patch HistoryEdit

Hotfix 19.6.3
  • Fixed Primed Chamber missing from the Codex for players that own it.

Hotfix 19.5.4

  • Fixed incorrect description.

Hotfix 8.3.1

  • Introduced.

See AlsoEdit


Start a Discussion Discussions about Primed Chamber

  • [PC] WTB primed chamber [PC]

    12 messages
    • wrote: wrote:50K plats and it's yoursI would like to buy it for 50k plat, pm me ingame (pc) WolfSpirit...
    • lol :P
  • Serration+primed chamber

    16 messages
    • @dikke you are wrong, and he is also wrong, not because he calculated wrong, but because the way the chamber mods are calculated isn't that way
    • To the lone tenno who said order matters, it doesn't. If Primed Chamber affects base damage then elementals go off the increased base,...

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