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I guess you are talking about the cams in the receiver itself. Now days I would say live tooling. The old days, probably a shaper. Some military models look as if it is forged in. The angle on the bolt lugs you are talking about would be like on a Carcano bolt? I know what you mean about curiosity. I had been given a small .25 auto made in Spain in the late 20's, I believe. There was a slot in an area of the slide I never could figure out how it was done. Look through some books on old ordnance plants and see what they were using back then. It is amazing what they turned out with what they were using.
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