IMHO - "P" and other letters on front of receiver ring are clean and free of deforming. Sometimes the "P" is not deep or clear.

Somehow, SA seems to have cleaned up around stamped numbers and letters, even if the steel was hardened??? It makes me ponder.

I posted a picture of a receiver that shows SPRINGFIELD heavily struck at both ends, but, lightly struck in the middle. All I can envision is that the Die had begun to bend?