How does a fully upgraded Tokyo Marui HK416 Delta Custom NGRS sound like? Watch this short video made by the Airsoft Lab... "This is a complete build internally and externally by me for a good friend.  It Is set up at 1.3 Joule and using a 7.4 25c. It’s fully upgraded inside with Jefftron Leviathan NGRS, WARHEAD motor, and Prometheus internals."