Airsoft Website Eccentric Wheel CNC Aluminum Hop Up Chamber Set for Tokyo Marui M4 M16 V2 AEG Gearbox AEG Rifles AirsoftEccentric Wheel CNC aluminum Hop Up Chamber Set for Tokyo Marui M4 M16 V2 AEG Gearbox Made out of CNC aluminum and plastic. Large Hop Up adjust dial design for easy and smooth adjustment. BB latching system prevent BB dropping after removing the magazine. The latching arm can also be manually pressed to release the remaining BB from inside the Hop Up chamber. More durable and accurate in feeding BB. Improves Firmness of the chamber and stabilizes the