ProWin M4 Hop Up Chamber for Tokyo Marui M4 AEG

ProWin M4 Hop Up Chamber for Tokyo Marui M4 AEG CNC Aluminum Construction ( Anodized Blue ) With Hop Up Adjustable Gear Parts Retaining clips and pins all designed for quick change of worn hop packing/rubber Suitable For Tokyo Marui M4 Series Airsoft Electric Guns AEG Rifle