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Stampings on barrel. Letter P meaning?

karlkurtz32
in Firearm Hobby / Sport Discussion

Featured Replies

The side of my barrel says:

 

P 5.56 NATO 1:7 Hammer Forged/CL

 

Does anyone know what the letter P means?

  • Quote

    Quick search revealed that P could mean Elisco Tool, which was in the Phillipines. They made barrels for Colt.

  • Quote

    Probably either proof or particle. My Colt A1 barrel has MP for magnetic particle tested.

  • Quote

    Historically it means Proofed. They will shoot a special high powered proofing round through it to test the strength of the barrel. If it can take the pressure of this special round, it will easily take the pressure of a standard round.

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