the norc 54 is indeed chambered for 9mm - it comes as a 7.62 and typically you do a barrel swap( it's in the box) and that's all you need to do- the mags are the same, and i found the good old winchester white box ( the dead cheap stuff) works about as good as everything else- BE DARNED SURE YOU HAVE THE CORRECT AMMO FOR THE RIGHT BARREL- either one will take a 9mm - i don't have access to 7.62 very easily, so the barrel is tucked safely away in the box it came in- besides, all my reloading stuff is 9mm, so that works as well
btw its parabellum, - so you're close- and there is no difference between 9mm unless you get something like 9mm browning long, largo, or something like that- put the two together and you'll see the difference