archwick stempelhoved type 2This precision crafted piston head is designed from CNC machined aluminum, ensuring maximum durability and reliability in your airsoft replica. It is equipped with a single O ring, which provides lower friction and higher rate of fire (ROF) compared to standard plastic models, without compromising on airtightness. Small ventilation holes in the design, combined with negative air pressure, optimize BB feeding and reduce the risk of jams. The O ring is