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I took the gun apart and felt a compression issue with the piston and the cylinder. Basically I placed my finger over the cylinder head port and moved the piston forward. You should feel substantial resistance doing this, and mine moved with ease. This told me that I had a compression issue in the cylinder.
My first thought was that this was related to the piston head o-ring. I was right.
I wanted to let you all know that you can purchase a compatible o-ring for the piston head at Home Depot (or other hardware store.) Get the 3/4" ring.
I put the 3/4" ring on the piston head and there was immediate resistance moving the piston forward with the cylinder head blocked.
I reassembled the gun and it now chrono's at 405 FPS.
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