Why not just build your own rather than buy a complete rifle? Personally, I don't care for the odd size hammer and trigger pins on a Colt so rather than buy Colt, I built mine using parts I found at gun shows, AR-15.com's equipment exchange as well as other on-line sources and I think I have come up with far more accurate A2 clones than anything that is offered by any factory. Here's a few of my A2 clones:
At top is an earlier gray A2 clone with large head forward assist, FN upper and barrel, early A2 pistol grip, NDS gray McKay lower and AN/PVS-4 starlight scope.
In the middle is a later A2 clone in black with the smaller forward assist, current pistol grip design and M9 bayonet. The one thing that while not really seen but is felt more is the heavier barrel with a 1/9" twist. You can't tell it from the outside but when you handle it, it's a lot more nose-heavy than the actual M-16A2 barrel that is lighter under the handguards. I would have liked to used a 1/7" barrel but back when I built this one years ago, it was a lot easier to come across heavy 1/9" twist barrels.
At the bottom is my 727/GUU-5P clone. It's pretty much identical to the GUU-5P I first carried when I came back into the Air Force with the exception of the longer 16" barrel rather than the 14.5" barrel on the military version.
Also in the picture is the AN/PVS-5 night vision goggles we were using in the Marines back during the late 80s and early 90s. Kind of cool to see where we were back then with both the PVS-4 and PVS-5 as compared to the AN/PVS-14 we are using today that can fill both roles as a weapon sight as well as a helmet mounted NVG.