We had this discussion before whether receivers were numbered before heat treat. Not sure which side I was on then, but today I would be for numbering them before heat treat. Don't ask which side I will be on tomorrow.
Speaking of cutaways, the photo is one I did for a customer this week. New part and I wanted him to see in the cross section how close the relief for the Allen drive was to the dog portion of the screw. Material is ETD-150 used a lot  in the oil field. Cut the part in half before I deburred it, so even the burr was split on this one.

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