If the courts were to apply the "in common use" test, from Heller, nothing from the AR platform would qualify as "dangerous and unusual."
The firearm must be both dangerous (and all firearms qualify for that description) and unusual (there is nothing unusual about a firearm that is in common use).
As to opening up the NFA to register these "assault weapons," I believe the Congress would have to rewrite the NFA. It is very specific as to what qualifies.
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