A important upgrade for your AEG.
Element AEG upgrade Series -Ball bearing silent piston head for Special edition.
A bumper-rubber is installed in piston head.
Offer ultimate noiselessness and keep you from detected during skirmish.
Ball bearing piston head absorb most of the tension from the spring.
The speedy head movement offer constant muzzle velocity.
Also this piston head can take more stability for your AEG.

Upgrading AEG require necessary skill & technique to dissemble the gearbox, consult expertise if needed.