A video taken By Airsoftology during the TWAAA Camo Festival 2017 that took place last June in Taipei shows a CO2-Powered MP40. It is not airsoft as it is a 4.5mm (.177 caliber) or airgun caliber. According to Jonathan Higgs, this is made by WinGun which is mainly made of metal with some parts made of plastic. Firing in full-auto it sounds really good. Now, if they make a version for airsoft, we'll grab one quick.