the gas tube is on there, should be right under the gas piston on the list of parts. the gas block goes on like the krebs FSB/FGB so its all allens. The part that had me most worried was drilling the port, just make sure you have everything exactly where it needs to be before you drill anything
I am confused. The gas tube is attached by allen screws? Can you post a close up pic showing the attachement. And what did you use to do the refinish?