Mach Sakai: King Arms Ultra Grade M4 TWS
OptimusPrime
04 May 2017
Mach Sakai tests the King Arms Ultra Grade M4 TWS or Training Weaponn System. This has a nylon-fibre railed handguard and collapsible crane stock. The gearbox has 7mm bushing and a quick spring change system. He tests it for operation and accuracy in this video.