[merc]

Does anyone know how to installa barrel on model 4?
I have the frame and barrel.
Can't figure how it goes.
It looks like a press in job from the chamber end.

 

[Herr Walther]

I would have to examine mine later, but you may look at one at Gun Parts Corp. web site. I believe there is an exploded view of a Model 4.

If it is anything like the Model 7, there is a pin holding the barrel in after it is pressed into the frame.