Originally Posted by Spider!
You need to tune with the gas you plan on using. CO2 and HPA behave differently.
That is the exact reason I asked the question I did. I noticed when I switch from S.C. to O.C. (O.C. using HPA) I need to make major adjustments to my velocity screw because of the different "properties" between Co2 & HPA.
Thanks for the reassurance.
Started with a Splatmaster, moved onto a Nelspot 007, then came the Autocockers, then "reliability", a STERLING Pump, next was a Bob Long defiant then a PM7. As of now I have 4 Sterling Pumps, 1 Phantom for SC and 2 Spyder's one is a future Spump.