I have been running the reg at 120 bar in the last few days, there's a 5 bar reg creep overnight, 20~30fps off on first cold shot slinging NSA 23gr slugs tuned for 940fps, can't validate POI at long range. Setting higher HS or Valve couldn't compensate for the cold shot bug this time around, it would work at 70 bar at the reg prior, but not at 120 this time. i might have to get me a heavier hammer to run the reg up 150~160 bar for the 35gr and 38gr NSA slugs to see if the symptom persist, going to try to tune it out, even if it's just a bandaid, before i shell out $170 for the "fix".
Personally, I could put up with this from one gun, knowing what i know now i would still buy the M4 again if i get to reset and do it all over again, there's far more pros than cons. But i do not want to buy another PCP gun with this same secret sauce built-in.