Well, seeing how no one wanted to answer me, I took action into my own hands.
I removed the hand guard, took one of the screws out of the front end, thankfully the rail didn't rise up but I haven't shot it. I then took that screw and put it in place of the one missing in the rear to pull the rail down.
I then put the rail back on. When the first rear screw slightly touched the gas tube, I went 1/4 turn more until the next screw just barely touched the gas tube.
I had about 3 threads left to the rear of it and the just tightened down the locking ring.
After I did this, I called the guy who built the rifle for me and asked if he had the other screw. He said that was the way it came from DPMS but he should be able to find me another screw to replace the one I took out of the front.
So, if the screws get in the way of the gas tube, just don't thread the hand guard all the way down. Only until one of the screws touches the gas tube then thread the locking ring up to the hand guard. Problem solved.