I believe that the M16A2 Colt is presenting to General Carson above is 8000001.
I was there with the General (flew up in his plane). I delivered the rifle to Weapons Training Battalion at Quantico, VA. where it (I believe) resides today.
For another interseting history perspective, check out the March 1996 issue of Machine Gun News, page 24-29.
I also think the rifle in the Andy Tilman article that started this topic was one I had at Quantico at the time. I hosted him several times there for several articles he did during that period. However, I don't recall the guy with the hair? The scope is actually one we were experimenting with (I have pictures of it on an early flat-top as well), and yes, that is an early ARMS mount, one of the first ones that were loaned to the USMC by Dick Swan. Also of interest in those days was Dick's PVS-4 Throw-Lever Mounts.