Kyrie,
Again, thank you for the outstanding explanation/description. I also have suspicions that the gun has been opened up. My suspicions fall more to the butt stock being a replacement. The checkering appears to be different between the PoW grip and the forend. I assume this gun was imported from Sweden and the appearance of the checkering on the grip has a very Swedish gunsmith style. Similar to that on some of my Husqvarna rifles. The wood also stands quite proud to the receiver.
Whatever the reason the action was opened up, it seems to function well, the wood is tight, and the gun balances extremely well even with the 30" barrels.