I think the barrel is original to the rifle. The serial# and the barrel date and the star gauge number that the book shows had no accompanying letter from serial# range 1220000 to about 1250000. There was a number of different styles of match rifles and I still think this used to be one. There were a few with full stocks(maybe that is why the band wear is on the barrel)and standard rear sights along with the Lyman sight. There was some .30 cal. rifles built on M1922 stocks. I'm sure you guys all have this book but here is a the section I am using to try to figure out what this is.

https://books.google.com/books?id=vb...0rifle&f=false