I had the same problem with my A1 fly, the gun aired up with no leaks but when i pulled the trigger with eye:s off it just clicked in the solenoid, didnt cycle at all. It was like Evil Rish said, a small indent on top of the solenoid, i removed the chasing of the solenoid and tried to get the piston out, it wouldnt move at all without serious force. Had to buy a new solenoid.