4 MOA is not that bad, that is even good enough to hunt with. People get really hung up on being able to shoot Minute of Angle, when the truth is most hunting rifles won't do it, and really don't need to.

And many that claim they can probably can't. They probably did it once or twice but I doubt that is their average group size. I strive for MOA with my guns, but if I can't get it I don't ditch the gun. Especially considering I use mostly slug guns and Muzzle loaders. I will except 3 inch groups at 100 yards from a bench. Then again I don't do any long distance shooting either.

And something too keep in mind is the M-16 is a military rifle that is designed to function, not unlike the AK type rifles. And it is also using cheap military ammo. These two combo's don't really lend themselves to precision shooting. I am sure the AR variants have tighter specs and are much more accurate with good ammo. Heck I bet if you took the time accurize and find the right load for a M-16 it would be more accurate. I have owned a few guns that were poor shooters until I found the right ammo for them.

Paul