Its around designed for a AR an its restrictive magwell. the AR is what 50 years old now? How long is our military going to keep try.ing to milk it ? as far as cost concerns and stuff they don't seem to have a problem wasting money on every other new fangled gadget for the military.
to me its attractive because it uses uses cheap ass brass an a 308 bore. Id have little use for it on a AR . I have a 308 sa.