Not waiting for a GBB version of the SIG Air ProForce MCX, Ivan Tong decided to build one himself using the Tokyo Marui MWS ZET System... This is a rather quick look at this build... "The MCX has always been a cool gun. However, there isn't an airsoft gas blow back version on the market, yet. Due to lock down and being extremely bored at home, I have decided to build my very own one with Tokyo Marui Zet system. ENJOY!"