AEA AEA hp max leak

I have a hp max .510 that I changed barrel to .457 that has a slow leak. It has a regulator and worked great all last year. I pulled it out of of gun cabinet a noticed it was empty. Filled it up and it slowly leaked out. I would say 300psi a day. Any suggestions on were to look first?
Thanks in advanced!
Brian
Sometimes it can be the fill valve. One way check valve gets stuck open slightly allowing air to escape.
 
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I had one of those briefly. I had issues with the valve seat deforming which will cause leaks out of the barrel.

I also had the issue with the stuck fill port mentioned above - there is a hex nut inside the air cylinder that can be used to adjust it if your gun is assembled properly (mine was not and had to be returned because of the issue). The other place where I had leaks was around the threads of the pressure gauge.
 
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