Abstract: The present invention is a pneumatic trigger mechanism intended for use with gas powered projectile guns such as gas powered paintball markers. The present pneumatic trigger mechanism utilizes a specialized pneumatic force amplifier which substantially improves trigger performance and firing cycle time. The pneumatic amplification feature of the present trigger actuator is double acting, in that it provides an increased force advantage for both the firing phase and trigger return phase of the firing cycle. Performance wise, the valving and the pneumatically amplified actuator of the present trigger actuator requires as little about 2 oz. of trigger pull force and as little as 0.01 inch of travel to activate a firing cycle.