You do not want to shoot that gun, it's toast. Hopefully you didn't pay too much but now it's a parts gun. There have been quite a few instances of older Flues cracking, usually the cause is too much cartridge, i.e. shooting an old gun with modern higher pressue ammo.

Welcome to the board, much to learn here and you're already contributing. Please post a photo of the crack, we love to see that stuff here.

Rob

My problem lies in reconciling my gross habits with my net income.
- Errol Flynn