As much as I love the AR15/M16 design, it is not without it's flaws,but then neither is the M14. The bugs have largely been addressed, but you can't blame him for not likeing a rifle that was rushed into service. Knowing what I know now about the modern M16's, I wouldn't hesitate going into combat(boy, you do not want me going into combat, what a joke)with one. Back then though, I'd probably be hesitant to. Something along the lines of "ZM Weapons or the HK G36" adress the imperfect gas system problems. Strengthining the buttstock/lower reciever union would greatly improve its field ruggedness also. Another area that could be improved is the magwell area. Even Stoner admitted it protruded to far, necessitating a compromise solution in the the design of the 30 round mags (a problem he did not repeat in the design of the SR-25).
In spite of all the above, I'm sticking with my ARs until something significantly better comes along, and I haven't seen or heard of it so far ( including the OICW).