Originally Posted by Cthulhu24
Get a Ninja pro reg and take out all the shims that i will put you right around 500-400 psi. should work fine.
With the Ninja PRO reg you'll want to remove 2 of the silver shims and leave 1 in which will bring you to 550 psi. The PRO reg has different shims than the standard Ninja regulator, our manuals are up on www.ninjapaintball.com
if you ever have any questions on shim adjustment.