Crossing fingers, reprinted some parts in the shroud, and reassembled it. Reset the striker. Filled with air, to 250 bar, and filled the magazine. At least with 17.6gr Norma's, the sound is subdued indoors. No, not mouse fart quiet, but honestly, pretty good. It will be fine outdoors. A dry fire is quite a bit louder. We'll see how long this keeps up. When airing up, around 100 bar, there's an audible click as something moves inside the action. Not sure what that is, but will have to remember that.
In all the thrashing, I had to unscrew the air tank to access the barrel. I was half expecting a leak upon reassembly. Fortunately it didn't leak. Have to re-chrony this again, have no idea what I set it do, it's about 1/2 turn off the bottom. Kelly had set it to around 900 fps for the Norma's. I had to set it to minimum when degassing (per the recommendations). Hoping there are no more unexpected dumps.