• Master's Chambers - Each [Master Round] the player carries permanently unlocks the mode of its respective floor. Reloading the Chamber Gun with a full magazine cycles through the unlocked modes. This synergy does not work with [Lich's Eye Bullets] .
• In the Keep of the Lead Lord , the Chamber Gun is a single target, semi-automatic gun.
• In the Oubliette , the Chamber Gun fires poison skulls.
• In the Gungeon Proper , the Chamber Gun is a shotgun that is somewhat similar to [The Membrane] .
• In the Abbey of the True Gun , the Chamber Gun is a piercing crossbow.
• In the Black Powder Mine , the Chamber Gun is a melee-range, high damage drill. Having [Flak Bullets] equipped, this form will fire small, spark-like bullets in front of it, with significant damage output. This is a good combination with [Orbital Bullets] .
• In the Resourceful Rat's Lair , the Chamber Gun is a rocket launcher which fires cheese wheels that encheese enemies, similar to those fired by the [Elimentaler] .
• In the Hollow , the Chamber Gun is a combination of [Glacier] and [The Exotic] ; it fires an ice cube projectile that bounces off walls and enemies, leaves a trail of water, and eventually bursts into several homing rockets.
• In the R&G Dept. , the Chamber Gun is a pencil which functions similarly to the [Wood Beam] , except that when you reload it, it flips to the other side (Pencil-> Eraser -> Pencil).
• In the Forge , the Chamber Gun is a beam weapon that shoots 2 homing beams of lava in a V-pattern.
• In Bullet Hell , the Chamber Gun is a homing chain beam similar to the [Raiden Coil] , hitting all visible enemies at once for high damage.
• All modes share the same ammo pool. Firing a shot in one mode reduces the ammo of the other modes by a proportional amount. For example, firing one shot in its Hollow mode uses up 10 shots of the base mode, because the base mode has 10 times the max ammo.
• The Chamber Gun is one of the three weapons in the NONE gun class that can be obtained in normal play, the others being the [Slinger] and the [Kruller Glaive] .
• If the player has [Chance Bullets] and does not switch to the Chamber Gun from a floor that does not have a [Master Round] (such as the Oubliette , Abbey of the True Gun , Resourceful Rat's Lair , or the R&G Dept. ), other guns have a chance to shoot bullets from that firing mode.

Visit all Chambers at least once