Well...couldn't leave well enough alone..Put a Huma replacement AMP reg in the Wildcat standard...got it in...started filling it & couldnt get the rear reg to read anything but zero....So I fiddled with it ...turnrd the delrin puck upside down..still nothing...pulled it out and put the other one i took out back in....Had to change to the NEW NEW..(latest & greatest supposedly)..brass reg piston.....delrin was in it. replaced all orings re-installed...NOW...it reads the fill pressure...it won't stop at say 90 bar..just keeps going...at 180..i stopped & released pressure on the pump...Knew that wasnt right......as an aside...sprayed leak detector on it...no leaks EXCEPT the fill probe...i dry fire & it spits it back at ya..Probly all the double loaded slugs...plus at least 25 tins of pellets since new...lol....any suggestions welcomed with open arms....WEEVIL....bail me out again bro...lmao......That the piston I'm referring to...opposite the delrin..no dimple on end like middle one