VERY easy...JMO. Put together a test rig to measure output pressure.I used one of these and a bleeder from a hydraulics shop. Bellevilles I got from Fastenal.http://www.ebay.ca/itm/New-Paintball-CO2-ASA-Adapter-Fill-Station-Remote-with-3000PSI-Gauge-/121824408804?hash=item1c5d4cf4e4:g:R~MAAOxyCepSaj05Easier if you've a large tank to fill from...lots of pumping otherwise.Bob has a few posts around on re-ranging the Ninja reg...should be a graph or something that'll put you close enough to warrant using the test rig to verify.Temporarily replace 1.8k disc with a 3k disc, and fill up to reg setpoint SLOWLY...if gauge on test rig goes beyond desired setpoint, stop, drain and try again.Re-install 1.8k disc when done.Al