Pneumatic projectile launching system

1. A pneumatic assembly for a projectile launching system, comprising:

a volume chamber;

a valve positioned within the volume chamber, the valve moveable between an exhaust position wherein flow of compressed gas from the volume chamber through the valve is facilitated while flow of the compressed gas into the volume chamber from a fill port is prevented, and a filling position wherein flow of the compressed gas from the volume chamber through the valve is prevented while flow of the compressed gas into the volume chamber from the fill port is facilitated, the valve being biased toward the exhaust position;

a body defining a continuous bore from a substantially open forward end of the body to a substantially closed rearward end of the body;

a nozzle positioned within the bore adjacent the forward end of the body, the nozzle moveable between a rearward position wherein the nozzle facilitates passage of a projectile through a projectile port, and a forward position wherein a projectile is fired and the nozzle blocks the projectile port to prevent passage of an additional projectile therethrough; and

a sear which retains the valve in the filling position and releases the valve into the exhaust position when actuated;

wherein a rear surface area the nozzle is in fluid communication with the volume chamber;

wherein a forward surface area of the nozzle is in fluid communication with a nozzle biasing chamber containing a compressed gas that subjects the nozzle to a rearward biasing force; and

wherein the rearward surface area of the nozzle is greater than the forward surface area of the nozzle so that a pressure exerted on the rear surface of the nozzle by the compressed gas in volume chamber is sufficient to overcome the rearward biasing force on the nozzle and the nozzle moves from the rearward to the forward position of the nozzle in response to the filling of the volume chamber with the compressed gas.

2. The pneumatic assembly of claim 1 wherein a secondary sear catches the valve as it moves into the filling position if the sear is currently actuated, then releases the valve onto the sear when the sear is longer actuated.

3. The pneumatic assembly of claim 2 , wherein fluid flow into the volume chamber is controlled by the position of the sear and not by the position of the valve.

4. The pneumatic assembly of claim 1 , wherein the nozzle is configured to move the valve from the exhaust position to the fill position of the valve when the nozzle moves from the forward to the rearward position of the nozzle.