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Looks fairly straight forward. But I'm not the one holding the part.
I'm guessing you're after what looks like a curved face in there, that's not millable?
In ascending order of likelyhood:
3d printed
EDM'd
5 axis milled
Klaus's hammer and chisel
Special built machine. Possibly a shaper of some sort.
and machine the part with a ball nose. I may be missing something but doesn't look too difficult as long as you can machine in 3 axis
Difficult to get a clear mental picture of that (for me). Is a larger photo possible?
Since the polygon rifling through hammer-forging was developed in Germany, and the M42 was a "low-cost" weapon of the day, I'd be willing to bet that all (or at least most) of it was "formed". Stamped, punched, etc. Apparently 423,000 of these guns were made (and I suspect a *LOT* of extra barrels), so I'd seriously doubt if there was much machining going on.
PM
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