I have a national postal meter carbine. I've done some research and have determined that it has a Winchester barrel, there is a "P" stamped on the top of the barrel. I know the government back in the day re-built these and piece parted them back together. I don't know what to look for to see if this is an all original or a re-build. and if it were to be an original what the value might be. I would appreciate any help I can get.
Thanks
Thanks

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