Regulated fill undo

I have the same tank. I modified mine so the regulator no longer works and fill my guns to whatever pressure I want. I think I added a thin washer to the stack of washers in the regulator. Drain the tank, then unscrew the regulator. I remember it being easy to take apart.

I have the same tank and am interested too. Mine only fills to 2500. I have sent it back to have it repaired. Worked for a couple fills than back to 2500. I use it for filling the Disco. But use my compressor to fill the Badger and Marauder. Just picked up a 60 minute 4500 Drager tank to fill the Badger now. 

If you over ride the 2,900psi reg you should upgrade everything else like the air line & fitting perhaps. Thet are rated for 3,000psi use and we would hope have no issue at a full 4,500 but the 4,500psi standard is 6,000psi hose & such.
Watching the rebuild vedio for a ninja reg would explain what not to do ( what you want).

John