Gas powered gun

A gas powered gun comprising:

• a gun barrel,
• a cylinder containing a piston rod slidably movable between a loading position in which the leading end of the piston rod is sufficiently withdrawn in the barrel to permit a projectile to be fed into the barrel through an opening in the side thereof, and a firing position in which the piston rod has moved forwardly to cause the leading end of the piston rod to engage the projectile and move the projectile forwardly in the barrel,
• a trigger operable to cause the piston rod to move from the loading position to the firing position,
• a pressurized gas supply,
• said cylinder having first and second chambers through which the piston rod extends, said pressurized gas supply supplying pressurized gas to the first chamber when the piston rod is in the loading position,
• said piston rod permitting communication between the pressurized gas supply and the first chamber and preventing communication between the first and second chambers when in the loading position, and when in the firing position preventing communication between the pressurized gas supply and the first chamber and permitting communication between the first chamber and the second chamber to cause pressurized gas in the first chamber to pass into the second chamber,
• said piston rod having a longitudinally extending passage extending from the front and rearwardly along the piston rod to a location where the passage communicates with the exterior of the piston rod, and
• said location communicating with the second chamber when the piston rod is in the firing position to cause pressurized gas to pass from the second chamber into the longitudinally extending passage to the front end of the piston rod to propel the projectile from the gun barrel.