What is abs dwell on paintball guns?

Answer 1

In high-end guns, and I am assuming you are referring to electronic guns, dwell generally refers to an electronic adjustment, that controls how long a solenoid is energized for.

In many high end, electronic guns, the solenoid is itself a type of valve, and supplies air to a ram or bolt kit to cycle the marker. In the case of a ram or rammer operated marker, the ram will actuate a hammer that hits a valve and then holds it open. So as with your mechanical marker, the dwell time will have a direct effect on how long the valve stays open - the longer air is supplied to the ram, the longer it will push forwards and hold the valve open.

In a spool valve marker, the ram and bolt are combined in to a single unit, and air from the solenoid pushes the bolt forwards, which in turn releases air to fire the ball. Assuming that the bolt can free flow, and isn't firing from a fixed volume of air (depends on the design of the spool valve) then the longer the bolt is in the forward position, the more air will be released.