I cannot say anything about other rifles but I can say that I have an m16 with a 20" heavy barrel and have yet to have it jam (that a whack on the side could not fix) after around a thousand rounds through it. I use the cheapest (Wolf... Russian) ammo and know that I could clean the thing a lot better than I do. In auto it performs fine.
One complaint in the article was the gas tube getting so hot that it lights the surroundings... if you are firing that much auto that fast you are likely not hitting anything accurately and need a proper heavy mounted machine gun. This is a rifle designed to fire fast... but it is an assault rifle not an MG42.
Anyways... maybe I have the one good m16 out there or maybe not. But anything as prolific as that weapon will always have its supporters and haters.
Regarding new models... we can always make better and will. The existing platform remains probably because it is dug in so much... but it will change eventually.
just my .02
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