Half Steel Gear & Bearing Aluminium Piston

This parts are manufactured under CNC process, it improves:

1) strength of piston;

2) durability of gears;

3) smoothness of shooting with extreme high power. 

The safe working load (SWL) of the piston is 1.9J. 

2 rubber rings are included. One rubber ring is used for standard T.Marui size gas cylinder. Another rubber ring is used for bore-up size gas cylinder and Wii Tech gas cylinder.