ultimate stempelhoved cncUltimate has their new piston head here. It is manufactured from CNC aluminum and comes with 8 built in pressure holes and an o ring to reduce friction when the spring is running. The ventilation holes are also made so that the o ring creates a seal against the sides of the cylinder. It is 14. 5 mm in diameter, which makes it fit in most AEG weapons. The thickness is 8. 6 mm
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