Featured on this Airsoft-Rus product presentation is the King Arms M4 TWS VIS Elite Series. This series feature aluminium alloy 6061 upper and lower receivers which are billet style. The railed handguard is CNC'd and the the integrated flip-up gas block front sight also has a removable rear flip-up sight. The gearbox is full metal that can accept most upgrades for the Version 2 gearbox.