I checked 50 pcs of Peterson brass today for flash hole centerline and roundness on my Nikon H14B Optical Comparator with Heidenhain Quadra Check DRO

Out of the 50 the worst piece was out of true center .0015 in X and Y axis with a total run out of .003

All flash holes were perfectly round to the .001

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I will perform more checks soon and report.

Maker of the Frankenstud Sling Keeper