An interesting ASMR episode by 4UAD Smart Airsoft as they feature an MCX Gas Blowback based on the Tokyo Marui MWS. You can check the parts and accessories used that are sources from Iron Airsoft and GBL. Apart from the upgrade, they do a quick test and mag dump. As it is an ASMR, better make sure you don't fall asleep off to dreamland, dreaming you are carrying it to the airsoft game field.