What does an expansion chamber do?
The main function of an expansion chamber is to keep the pressure up in you marker so the hammer, (or striker), will blow back behind the sear. A CO2 tank normally provides approximately 850 pounds of pressure to propel the paintball as well as re-cock the marker. When the pressure in your tank drops, due to factors such as cold weather, shooting your marker fast or getting your tank freshly filled up then the hammer will not blow completely back behind the sear causing your marker to “burp” or go “fully automatic” and generally you’ll have to re-cock the marker. When an expansion chamber is installed on you marker, the CO2 has to work its way thru the chambers which increases the pressure to the level needed to re-cock the marker. Note the picture of an expansion chamber broken down. The flat dividers separate the chambers and generally have small holes in them which the CO2 has to “fight” thru, forcing it to expand as it goes thru each chamber. So when you hear the term “4 chamber” o
