A couple of years ago I got a carbon fiber tank and gauges from Brancato…It has always lost pressure over extended periods of time. It set for about 8 months and it lost well over a 1000 psi for air according to the gauge…I just got it filled to a bit over 4500 psi yesterday and I am wondering if it would hurt to dip the entire top of the tank, gauges and all, into a container of water to see if I can see a very small bubble of air and then try to tighten that fitting if possible…Back to shooting the Marauder again after some time away from it—prefer to shoot the smokeless in all reality. Enjoyable, but I simply never could adjust it to get the classic bell curve—yet, it is still a pretty good shooter for around 20 rounds, but 15 is better. I returned it to factory settings as indicated by instructions I got from Benjamin…Thanks…BCB