Part 2 of the upgrade process as presented by Jai  of Epic Airsoft HD as he observes Airsoft World do the surgery... "Welcome to Part 2 of our Modify/Madbull upgrade video. We've already sucessfully installed the gear-set and piston that were sent from Echo1USA in our unboxing video. Echo1USA work very closely with Modify and Madbull to bring you guys some of the best and most affordable guns on the market! This part AirsoftWorld Tech Frenchie shows us how to install the hop-rubber/bucking and we'll see on Sunday if we can get better results!"