What is the Z-body and the Z-Valve?
The z body is a square shaped aluminum body that was a small rubber adjustable peice in the breech. When the ball is fired the piece of rubber puts a back spin on the ball. This gives the ball more distance(msrp $280)
The z-valve is a replacement on/off assembly for the automag/minimag. There is also a model available for the RT/RT Pro/Retro Valve. The idea is to give the gun "reactive capabilities" and increase airflow. Due to poor machining tolerances, this part sometimes works sometimes doesnt.(msrp $42.50)
Both are made by Galatic Systemz.