G&P MWS Forged Aluminum M4 Upper Receiver w/ Hopup Chamber (Cerakote Black Finish) for Marui M4A1 MW

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