1899 Guy, I never heard of that, but the weird thing is, I was just bidding on an older 99 T/D and that is what the seller was saying may have happened because it will not break down. It is drilled and tapped, so I just figured somebody ran a scope base screw too deep. I doubt it is a case like yours because it still has a T/D forearm. It may be really screwed up and silver soldered or welded on to correct a loose barrel. I took a chance and it is on the way. Guess I will find out.
I bet they had a barrel for yours laying around with no threads on yet. The pitch is not the same on the square threads and "V" threads. There is not really enough material on either one to change it by threading over the top of one. Another of those mysteries we will probably never know about.
