CNC Double O-ring Aluninum Piston Head with Bearing

The ventilation holes on the piston head can greatly increase the speed that the piston travels,
The piston head has a special design which can decrease the friction occurs when the spring compresses. This design not only can prevent the malfunction of the spring, but also increase the durability of it. The longevity of the battery can benefit from this design as well.

Material：Aluminium alloy

N.W. ：12g