One in the Chamber [MTS/IV] Quick and Powerful Guns!
by cbcosmic
One in the Chamber adds Immersive Vehicles firearms that hold a single round, so players fire one shot at a time and reload without a magazine.
What it does
The mod is a content pack for Immersive Vehicles, and it changes how handheld weapons work in that setting. Its firearms are built around a one-chamber design: a weapon carries a single round and draws its ammunition directly from the player's inventory, so there is no separate reloading step to manage between shots. Firing works much like a vanilla Minecraft bow, which keeps the pace of duels and skirmishes quick.
The selection is meant for balanced encounters, letting players pick weapons suited to facing down hostile mobs or challenging friends to a duel. Since it is a pack for Immersive Vehicles rather than a standalone system, it depends on that mod and on the Minecraft Transport Simulator line of content it extends.
The mod runs on Forge and NeoForge across nine release versions, 1.12.2 – 26.1.2, and needs both client and server to run. It is open source, and the author provides the pack as-is, so derivatives and forks follow the same terms as the original.
Key features
One-chamber firearms
Each weapon holds a single round, so every shot is a deliberate choice rather than a burst from a magazine.
Inventory ammunition
Ammunition is drawn straight from the player's inventory, with no separate reload action to perform.
Bow-like firing
Firing follows the pattern of a vanilla Minecraft bow, so the controls feel familiar to players.
Duel and mob combat
The weapon selection suits both one-on-one duels with friends and fights against pesky hostile mobs.
Gallery
Compatibility
Latest build for each game version and loader.
26.x3 of 3 versions with builds
1.21.x1 of 1 version with builds
1.20.x1 of 1 version with builds
1.19.x1 of 1 version with builds
1.18.x1 of 1 version with builds
1.16.x1 of 1 version with builds
1.12.x1 of 1 version with builds
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Who it’s for: Players who enjoy Immersive Vehicles and want firearms for duels or combat, and server owners who run Immersive Vehicles packs and want a simpler weapon set for their players.
Questions
Does One in the Chamber need Immersive Vehicles?
Does the server need the mod installed?
Which versions are supported?
More from cbcosmic
What the author says
One in the Chamber (or OITC if you prefer) is an addon pack for Immersive Vehicles that reshapes handheld munitions-based combat! With a balanced selection of firearms to choose from, you'll have no issues with facing down those pesky mobs and dueling your friends - or enemies! Don't worry about reloading, you've…
Official listing
- Modrinth page
- modrinth.com/mod/one-in-the-chamber
- Owner
- cbcosmic
- Published
- 2026-04-21
- Updated on Modrinth
- 2026-04-25
- Facts verified
- 2026-10-15