I was replacing the pressure gauge on my .25 wildcat today since the factory one was off about 12 bar and AOA offered to send me one for free. The problem I'm having now is that the rifle won't cock. All I did for the disassembly of the gun was let out the air by following Ernest Rowe's suggestion of compressing the valve stem, then I unscrewed the gauge and put a new one on. I don't understand how that affected anything internally. I have called AOA to talk to a technician, but I had to leave a voicemail and they have not yet called me back. I am hoping on of you know what I'm doing wrong so that we can prevent anyone else from having this problem.