This CNC machined piston head is designed to replace the standard cup-seal in Tokyo Marui gas blow back pistols with a 13.9mm cylinder in the loading nozzle. A high quality O-ring on a precisely machined aluminium body is used to provide a better and more reliable seal than worn or poor fitting cup-seals which can increase gas efficiency and in some cases fps.
Each piston head is machined from 6026 T9 aluminium to a tight tolerance and includes 2 spare O-rings (3 in total) ready for future replacement and a stainless steel Torx screw.
A small amount of silicone oil or grease should be applied to the O-ring during installation.
Designed & manufactured in the United Kingdom by Lees Precision Engineering.