There is a Springfield trapdoor 5 groove barrel on E Bay appears to be genuine with 2 PP proof marks and V P & eagle. Bore looks good, shinny receiver is damaged according to write up. It is an early square breech block notch and the tang is also damaged. I just listed all the pieces to build one receiver #1075xx but no stock so a rare 5 groove could be built. I would love to but my sudden change in circumstances won't let me having to sell extra parts too.
Jim