Installing A MadBull DD M4 RIS II On Echo1
OptimusPrime
13 Jun 2014
Brian at Echo1 USA wants to share again this video that he posted almost a year ago. For those who do their own external upgrades using MadBull Airsoft products with Echo1 airsoft guns as base guns, they can follow this howto --- installing the MadBull Airsoft Daniel Defense M4 RIS II on an an Echo1 AEG. Better bookmark if you intend to go on a similar project.