Originally Posted by Mr. Stealthy
You need to use low pressure or super low pressure. In a pinch, you can probably get away with high pressure however you run a significantly higher risk of blowing the internal macro seals in the marker. They simply aren't designed for high pressure. This also depends largely on what your manufacturer sets its tank at as "high pressure".
I would absolutely not recommend using super high pressure on the marker however as this even further exceeds the pressure range that the seals were designed for. Spend a little extra cash and get the right tank regulator for the gun (The ninja adjustable reg works great).
You are right about the pressures, but there is no internal macroline on a g6r. All the air passages are milled in the grip frame and body.
If you use hp you risk blowing any oring that is in between the gun parts. Either in between the asa and grip, or between the grip and body halves.