A pneumatic assembly for a projectile launching system comprising: 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 nozzle blocks the projectile port to prevent passage of an additional projectile therethrough, wherein in the forward position fluid flows through one or more radial ports in the nozzle and in the rearward position fluid is prevented from flowing through the one or more radial ports in the nozzle ; and a fluid control valve , actuatable between a first position that facilitates passage of fluid from an input port to a rear of the nozzle and a second position that prevents passage of fluid from the input port to the rear of the nozzle while also allowing passage of fluid from the rear of the nozzle to atmosphere; and a nozzle stem , upon which the nozzle seals and through which fluid can flow between a nozzle fluid chamber and the fluid control valve ; and a secondary valve body including a bore into which the nozzle stem extends and within which the nozzle linearly moves, said secondary valve body and said body for providing an internal passage for fluid between a firing chamber and the input port ; wherein, when the system is idle, compressed gas fills the firing chamber surrounding the nozzle section and biases the nozzle in the rearward position; and wherein the system is configured such that, during a firing sequence, gas flows between the input port and the nozzle fluid chamber and the gas contacts the rear of the nozzle and pushes the nozzle to the forward position; and wherein the firing chamber is configured to release compressed fluid through the one or more radial ports in the nozzle when the nozzle is in the forward 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 nozzle blocks the projectile port to prevent passage of an additional projectile therethrough, wherein in the forward position fluid flows through one or more radial ports in the nozzle and in the rearward position fluid is prevented from flowing through the one or more radial ports in the nozzle ; and a fluid control valve , actuatable between a first position that facilitates passage of fluid from an input port to a rear of the nozzle and a second position that prevents passage of fluid from the input port to the rear of the nozzle while also allowing passage of fluid from the rear of the nozzle to atmosphere; and a nozzle stem , upon which the nozzle seals and through which fluid can flow between a nozzle fluid chamber and the fluid control valve ; and a secondary valve body including a bore into which the nozzle stem extends and within which the nozzle linearly moves, said secondary valve body and said body for providing an internal passage for fluid between a firing chamber and the input port ; wherein, when the system is idle, compressed gas fills the firing chamber surrounding the nozzle section and biases the nozzle in the rearward position; and wherein the system is configured such that, during a firing sequence, gas flows between the input port and the nozzle fluid chamber and the gas contacts the rear of the nozzle and pushes the nozzle to the forward position; and wherein the firing chamber is configured to release compressed fluid through the one or more radial ports in the nozzle when the nozzle is in the forward position. <EOS>