Big problem..

[Polish]

Well.. I was being a moron today at work and I cranked the velocity screw all the way in on my 68 Mag.. dry fired a few shots from it and then air started spraying out the barrel. So I strip the entire thing down, replace every o-ring.. oil them.. coat them with dow.. checked everything.. and it still doesnt work. My guess is a crack in the power tube.. also when I hold down the trigger it doesnt leak..

I have a 68 classic mag.. all stock internals..\

Any help would be appreciated.