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3rd time was a charm thanks for the help

I am brand new to PCP guns. So is there a check valve on the rifle that should shut after filling ?

I am trying to fill my new Hatsan Bullboss. I am using an air compressor. Hooked eveything up and filled the tank on the gun. I shut the pump off at 20 bar which the guage on the gun showed at 20 also. Opened the air release valve on the compressor to take the air hose off but the tank on the...

Help I am trying to fill my new Hatsan BullBoss. I am using an air compressor. I filled the gun to 20 bar turned off the pump and opened the air release valve before taking the air hose off and it emptied the rifle tank. What am I doing wrong ? Jeff