I suspect it was not a special order, unless it letters as such. It was either converted, or a so-called "lunch box" gun that a factory employee made up.
One of the hardcore collector members (Doc44?; I can't recall) has a 58-29 I think it is called. An M58 made in .44 magnum, a one off for a special customer and I think not authorized.
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NHI, 10-8.
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