Viewloader has been in the paintball industry for years. They literally revoutioned the motorized hopper industry and now they produce a line of sleek paintball guns. The Viewloader paintball guns are based on a simple and reliable blow back system. When you pull the trigger, the trigger disengages the sear which allows the spring driven hammer to go forward. This pushes the paintball into the barrel and then the hammer will hit the valve exhausting air through the valve and into the barrel which "fires" the paintball. Air the escapes from the back of the valve driving the hammer back into position to "cock" it. This simple firing mechanism allows for reliability that will keep you on the field playing instead of off the field fixing your paintball gun.