path 71 in cylinder 26 the air pressure moves the piston 25 of the rod 24 along with the bolt 22 to the retracted position after a paint ball has dropped into the barrel bore 52 of the gun body 50 the program in the circuit board 20 deactivates solenoid valve 38 with the solenoid valve 38 in the u201c off u201d position the regulated pressurized air is routed in the air passage distribution system 36 to be directed into the center passageway 70 of cylinder 26 the air pressure forces the piston 25 rod 24 and bolt 22 to the extended position as indicated by the arrow in fig5 e the bolt 22 extends forward to close the inlet 29 at this time the bolt 22 also positions the paint ball for firing when the trigger 18 is again activated this cycle is the same u201c ready u201d condition as shown in fig5 a so that the firing process can be repeated other optional features may be provided such as a mechanical on off switch 80 to disengage the circuit board 20 to provide a safety switch for the paint ball gun a low power led signal 82 may also be available to warn the user when the battery 16 charge is low another option is a sensor 84 which senses whether the bolt 22 is fully forward after loading a paint ball in the barrel 52 such as in the position shown in fig5 e if the bolt 22 is not fully forward the sensor.