Abstract: The trigger assembly includes a frame attached to a launcher body, a sear pivotally mounted on the frame and having a first sear end with a hammer holding surface, and a second sear end with a trigger contact surface. A trigger is pivotally mounted on the frame and has a trigger sear arm, a sear adjustment screw received in a threaded bore in the trigger sear arm and in engagement with the trigger contact surface on the sear. A valve operating linkage is connected to an actuator control valve and to the trigger. A sear lug on the bolt engages the hammer holding surface on the first sear end to hold the hammer in the cocked position. The sear lug is adjustable relative to the hammer. The valve operating linkage is also adjustable.