One in the Chamber

One in the Chamber is a Wager Match game mode featured in Call of Duty: Black Ops, part of FFA Gunplay in Call of Duty: Modern Warfare 3, an optional game mode in Call of Duty: Modern Warfare 3: Defiance, and as a party game mode in Call of Duty: Black Ops II. It returned in Call of Duty: Black Ops 4 as part of Operation Grand Heist. It was added to Call of Duty: Mobile in Season 2, Call of Duty: Modern Warfare in Season Four, Call of Duty: Black Ops Cold War in Season Four, Call of Duty: Modern Warfare II in Season Two and Call of Duty: Modern Warfare III in Season Three.
==Call of Duty: Black Ops==
One in the Chamber consists of six players competing in a Free-for-All style game with a twist: each player starts off with only an insta-kill M1911, a single round of ammunition, a knife, and three lives. Players are equipped with Lightweight, Scout (though it has no effect), and Marathon Pro.
Once a player has fired their bullet, the only means of acquiring another one is by getting a kill. This means that if a player kills an opponent with a bullet, they will get that bullet back. However, if a player happens to have no ammo left, then their only remaining method of killing is by knife. Knifing earns one bullet, which means that players can have more than one bullet at a time if they choose to knife their enemies as opposed to shooting them.
When only two players are left, a Spy Plane will appear to show both players on the radar as a way to prevent camping which would excessively prolong the match.
The winners of One in the Chamber are the players with the highest scores. Kills earn 100 points, while Survivor Bonuses (being alive when another player is eliminated) net 10 points. While it may seem as though it's a Last Man Standing setup, it's easily possible to be in the money without being one of the last few alive.
==Call of Duty: Modern Warfare 3==
One in the Chamber returns in Call of Duty: Modern Warfare 3 originally only as a Private Match-exclusive mode. Like in Black Ops, the player gains ammo by killing enemy players with a one-hit-kill (can be disabled) shot or with a knife, but here the weapon featured by default is the Desert Eagle, and the player starts with 2 lives (both of these values can be changed in the Private Match Mode options).
On March 30, 2012, One in the Chamber was added to the Community Playlist as part of FFA Gunplay. In this gametype, the P99 with Tactical Knife is used. Once the player dies three times, they can spectate the remaining players and choose one to back. When a spectator backs a player, the spectator gains 150 XP for each kill the player they're backing makes. When there are only three players remaining, a UAV will activate for all players.
==Call of Duty: Modern Warfare 3: Defiance==
One in the Chamber, for the first time in the Call of Duty DS titles, is added as an optional match mode. Similar to Call of Duty: Black Ops and Call of Duty: Modern Warfare 3, up to six players compete in a Free-for-All game. Each player is equipped with a Desert Eagle with only one bullet and their combat knife. (throwing knives have been disabled)
The rules do not differ much from the console version, but the match time limit as well as point limits can be set before match.
==Call of Duty: Black Ops II==
One in the Chamber returns in Call of Duty: Black Ops II as a Party Games mode. The players are given a KAP-40 as their starting pistol. The player is unable to change the starting weapon in custom game modes.
==Call of Duty: Mobile==
One in the Chamber returns in Call of Duty: Mobile under the different name of One Shot One Kill. The players were initially given a J358 as their starting pistol, however as of the latest update, it was replaced with a .50 GS as a starting pistol. There are power-ups delivered across the map similar to a Care Package through random intervals. Opening the power-up packages will give the player infinite ammo and six bullets instead of a usual three in a limited amount of time, and these helicopters can be destroyed to prevent delivering power-ups to be used by the opponents.
==Call of Duty: Modern Warfare III==
One in the Chamber returned in Call of Duty: Modern Warfare III during the Season Three update on April 17th, 2024.
OneInTheChamber Promo MWIII.jpg
==Gallery==
OITC HUD.png|One in the Chamber HUD.
OITC Firing Range.png|Match start on Firing Range.
OITC Summit Kill.png|Kill on Summit. Notice how the player is given an extra bullet.
OITC Firing Range Start.png|Firing Range loading screen.
OneInTheChamber Gamemode Icon MP MWII.png|Modern Warfare II playlist icon.
==Videos==
One In the Chamber on Crisis|Gameplay in Call of Duty: Black Ops on Crisis.
Call of Duty Black ops - One in the chamber (wager match) 9-0|Gameplay in Call of Duty: Black Ops on Summit.
Modern Warfare 3 One in the Chamber - P99 Gameplay!|Gameplay in Call of Duty: Modern Warfare 3 on Hardhat.
Call of Duty Black Ops 2 Multiplayer - One in the Chamber - Nuketown 2025|Gameplay in Call of Duty: Black Ops II on Nuketown 2025.
==Trivia==
*In the original Wager Match trailer, One in the Chamber featured a Makarov, rather than an M1911. The One in the Chamber icon still has a Makarov however.
*The maximum amount of bullets a player can have in their pistol is seven, which is the same as the M1911's magazine capacity in multiplayer.
*In Call of Duty: Black Ops, the player can play a fake One in the Chamber in Private Match by finding it in Theater Mode.
*The KAP-40 is semi-automatic in this game mode.
Category:Call of Duty: Black Ops Gametypes
Category:Call of Duty: Modern Warfare 3 Gametypes
Category:Call of Duty: Black Ops II Gametypes
Category:Call of Duty: Black Ops 4 Gametypes
Category:Call of Duty: Modern Warfare (2019) Gametypes
Category:Call of Duty: Black Ops Cold War Gametypes
Category:Call of Duty: Modern Warfare II Gametypes
Category:Call of Duty: Modern Warfare III Gametypes