My bad, just googled exactly what you are asking about. I've never seen one of those until today.
If it uses pistol mags, then they can be as many as 10 rounds and still be legal. It's a loophole, but still legal.
If the barrel is 16.5 like the one I just found using a google search, it is most likely restricted. Some short rifles like that sneak through the cracks and wind up non-restricted though. Our super-awesome laws make it tough to decipher. My gues would be restricted though.