I have a Zbroia Kozak FC. Apparently there is an air leak. The tank is at zero. And when I try to air it up. Air comes out the barrel and it will not build pressure. I’ve alway keep the tank pressure above 200 Bar. It has been a month or so since the last time I shot it. I did not notice any problems. So my guess is the seals are at some relaxed state. What does it take to pressurize this ? Or is this an obvious failure and maybe someone out there knows of the issue. Any suggestions would be greatly appreciated.