US Army forces AWG to give up 416 in Real World Military Posted April 7, 2008 I have yet to understand what would be so hard about replacing the M4's gas system with an HK-style gas system. On the other hand, I suppose I do understand. Bureaucracy at its finest. Drop in conversion: http://www.defensereview.com/modules.php?n...le&sid=1109 I have been keeping an eye on these people, but apparently they have still not filled their orders to LE & military. I would love to try one of these out on one of my project guns.