Sorry Don, I am not aware of such "established" thought. I think modern manufacture of these magazines is one of GT's back burner projects, and believe that he is also of the mind that they are extruded.
Unless I see some credible evidence to the contrary, my machinist/gunsmith background experience believes these are extruded, with forged feed lips... If I am mistaken, I would love to know how they are/were actually fabricated. Do you have a reference? Thanks, -John
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