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Old December 17, 2012, 11:39 PM   #12
James K
Join Date: March 17, 1999
Posts: 24,127
I have checked a couple of my WWII M1 rifles, and they do have a P on the barrel just ahead of the chamber area, but too far down toward the bottom to be seen without removing the barrelled action from the stock.

Other marks were used, but P generally meant a barrel proof.

Jim K
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