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Te Letter P means that the Rifle was Proofired in that Stock, Wether you have the Same Rifle or the Same Stock is Unlikely since all M-14s or Stocks That you can buy have beem Demilled, also the P in the Stocks wether the have a Circle around them or a Square around them Means different Arsenals,all replacement Stocks where not Marked either with a P or a Cartouche (Bill Ricca please Correct me if I am Wrong on this one)
