Offered piston is made of aluminum alloy with a lighter body and the metal teeths It has 19 teeths and is suitable only for SR25 or L85. Not for common AEG!.
Included is a straight aluminum piston head with bearing. It is produced by CNC machining. It contains in addition to the head backpressure also a metal washer, ball bearing, bolt and washer against self-loosening.
