It could actually have a niche in the AR market. Load it down to subsonic levels and it would be a very nice, big hole making, suppressed round along the lines of the Russian 9x39. Load it hot and it would be twenty rounds or so of a .357 magnum on steroids for home defense. In a pencil barreled lightweight AR, it would be 21st Century equivalent of a Winchester 92 for all around use.
