Jwheeler:

Really neat mystery.

Stock has filled pinholes for a cheekpiece, I take it?

I have Husqvarnas with front sight bases where the solder joint absolutely cannot be seen, and the sight base looks to be integral with the barrel, but is not, at least, "can't" be per the production type used during the time they were made.

If yours are soldered on, they were done so quite expertly. The bridge base on your rifle would have to be really skillfully mated to blend in with the radius of the charger hump. Is it possible the charger hump was milled thru to receive the base?

Also, look at the rear sight base and the front sight base; How well are they mated to the barrel?

Would love to know what the original rings looked like...