G&P MWS Forged Aluminum M4 Upper Receiver w/ Hopup Chamber (Cerakote Black Finish) for Marui M4A1 MWS GBB
Aluminum Construction (Black Cerakote finish)
Cerakote finish For better resistance to the elements and/or potentially corrosive chemicals.
Design For Upgrade the Original Parts More Durable
Comes with a hop-up chamber to further maximize the performance of the rifle
Suitable For Tokyo Marui M4A1 MWS Series Airsoft Gas Blow Back GBB Rifle