What is an Expansion Chamber?
An Expansion Chamber is a device attached to a paintball gun designed to reduce occurrences of liquid Co2 getting into the valve area. Expansion Chambers accomplish this by routing Co2 through a passage or series of passages, which allows liquid an opportunity to boil, or expand into gas. When do you need an Expansion Chamber? The introduction of liquid Co2 into a valve system can cause pressure fluctuations which lead to velocity spikes. This occurs most frequently on paintball guns which use a “bottomline” set-up. Since liquid Co2 follows gravity, the horizontal orientation of the bottle in combination with the various angles at which the gun is held by the user allows the erratic introduction of liquid Co2 into the system. Any gun suffering from this problem can benefit from an Expansion Chamber, although like any anti-liquid system it is not always 100% effective. Since remote lines serve a similar purpose and are most often connected to bottles in a vertical position, guns with re
