The action on a model 39 isn't all that complicated.
Maybe we can help you with it.
Can you be a little more specific about "Not feeding"?
The action operates in steps. First, it allows a cartridge to come partially out of the magazine where it's held ready to go on the elevator.
Next, the cartridge is fed onto the cartridge elevator and raised up to the level of the chamber.
Then, the bolt pushes the cartridge forward on the elevator and the nose enters the chamber.
Next, the cartridge is forced under the extractor hook.
Finally, the cartridge is pushed all the way into the chamber and the bolt locks.
Can you look carefully at your rifle and identify these motions as you slowly work the action?
If you can determine where the problem is happening, there's a good chance one of us knows what to do to make it work.
I'm sure there are several people that would love to help.