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Re: Early M73 Breech Blocks

Posted by Lane Douglas on Wednesday, 10 October 2012, at 3:30 p.m., in response to Re: Early M73 Breech Blocks, posted by Dick Hosmer on Tuesday, 9 October 2012, at 9:21 p.m.

I think the arch is actually part of the radius of 2 different diameter milling cutters used to make the cut. The smaller diameter cutter produced a tighter (smaller) radius, and left the triangular shaped material. LD


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