The sequence of marking is confusing in some ways so here is what I am wondering about: Acceptance marks are made when the rifle enters military service
DP marks are made while it is in service
Proof marks are made when it leaves service


My rifle is Stamped "DP" on top of the receiver. Am I correct in saying this was done by military examiners/inspectors?
The same rifle has proof marks, Am I correct in saying that the proof marks were stamped when the rifle was released from military service? Therefore ,would it be true that the rifle was inspected and safe when sold from military service?
If so, why was the DP not removed or crossed out?
How can I tell if the proof marks were made after the DP marks?
I can post pics of the marks if needed
Thanks in advance,, I know Peter will have the answer.
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