the present invention is a specially curved discharge port and port within a bolt within the breech for a compressed gas powered gun for the firing of projectiles . the invented gun has many improvements over the prior art including the use of improved gas pressure routing allowing for operation at lower pressures with no decrease in firing rate , efficiency , trajectory , or range . the structure of the present invention provides for embodiments which include the use of specific maximum angles within the gas passage from a compressed gas storage chamber and a portion of the breech through which the gas is routed as it expands to launch a projectile from the gun .