Upon being accepted into government service it got the acceptance cartouche, it go the circled P once it was proofed. If re-built while in government service it would not need the cartouche as it was already accepted but it would be re-proofed thus getting the circled P but no cartouche. Do we not come across trapdoors and Krags bearing the circled P but not the cartouche, frequently? This scenario would explain it.
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this is a rifle I want!
"A man with a tractor and a chain saw has no excuses, nor does he need any"
Me. "Consistency is the hobgoblin of little minds" Emerson "Consistency is the darling of those that stack wood or cast bullets" Me.