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| Topic - IBM receiver with flat area Posted: Jun 10 2020 at 11:51am By New2brass |
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The following is just a guess!
They would "Gang" mill the receivers to the final profile. This would be an arbor with several profiled cutters would be sandwiched together to make the cut. The cutter in the middle may have left an odd profile when it got to the dovetail which was in excess of tolerances, or maybe it was done on separate passes and the arbor needed to get closer to the dovetail. Maybe at some point there was a variation of the forgings and the cut would be to great so they reduced the profile Again, just guesses! Notice how the flat area is cut perpendicular to the longitudinal cuts of the receiver @carbine kid, Pics?
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