ZCI Aluminum Piston Head

Amazing piston head. Quite lightweight and the ports are a little larger than normal, also the ports are concave, (wider at the top). Which reduces a little weight and helps airflow get to the O-ring for expansion. These come in random color, mine came in red. Also the O-ring that came with it was brown in color and was a bit small. But this head matched with the Lonex hollow (U shape) O-rings give perfect airseal. Product gets 9/10