archwick stempelhoved type 1Upgrade your AEG with this solid piston head made of precision milled 6061T6 aluminum. The model is equipped with two durable O rings that ensure a superior air seal and thus higher output speed and more efficient operation. The small ventilation holes and negative air pressure design improve feeding and reduce the risk of system blockages. The O rings are made of a specially developed rubber compound that provides maximum durability and perfect air