I own a 6.0 as well, and the manual says it should run between 650-850 psi. But I found at those pressures that the reg does little to help performance considering it's a high-pressure marker. Not to mention the stock reg is junk (in my opinion).
It can run at standard bottle output pressures. Before I started my low-pressure project had an expansion chamber on it and ran it with co2. Worked very well I might add.
To keep things simple I just run it with standard bottle outputs.
As far as tuning goes, what needs to be tuned? Is it not functioning correctly?
, PbNation (old) (new)
Rattlehead22 scammed me! Don't deal with him!