Significance of 2 P on barrel

[icraker]

I asked this question in another thread, but figured I would start a new one.

What is the significance of 2 P proof marks on a barrel? I have 2 P proofs on my late rock-ola barrel. I see there is an option for 2 P on the carbine club data sheet, so surely this has been researched. Any information or thoughts would be great.

See pic:

http://i762.photobucket.com/albums/x...e/DSCN1139.jpg

Information

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[icraker]

All,

Posted same on CMP forum and got some replies.

Significance of 2 P on barrel - CMP Forums

[painter777]

A Thanks to Brian and Bill for their help.

Charlie-painter777