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Nope I think you are not correct IIRC there were a few releases (A,B, N) that had different adjustment knobs. If I remember correctly the earlier releases were removing the pressure from the seat when the reg is not pressurized , the later had a simpler knob without that feature.
The earlier versions require an extra upgrade of the knob if you want to upgrade the barrel. (Mine was of that kind)
So am I correct that all pre 2011 s600s are the same minus some cosmetic diffrences?
IIRC? Is there something that would tell me which ones are which. Ive found a few but I would like to know what the differences are. Thanks for the help.