It looks like a 300 Whisper from what little bit I've found on it. I built an AR-15 in 300 Whisper and have a Contender barrel in it. I want to build a bolt gun in it also. I think if the ammo became cheaper and more available ,it would make it. It is a good deer round. I think it would be a great round for our armed forces. To convert the .223/5.56 AR's is just a barrel and gas tube change.
We use 5.56 in part because that's what NATO uses. So to maintain compatibility of ammo across allied nations, a change would require everyone's weapons to change. And with the M855A1 and Mk262, you can do some pretty amazing things with 5.56.
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