Shotgunner,
I don't know much about the modern repros, but I have an original Rolling Block, which was assembled in Sweden, but used a receiver made by Remington in the US. It's chambered for the Swede equivalent of the .50-70, so I had the chamber reamed to the .50-70 Govt. caliber.
Mine is a sporting model, with heaqvy full round barrel, and a great shooting gun! It was also very inexpensive. I bought it off antiqueguns.com, and it was a little over $400. The gun came fronm a fella in England, (AP Blades) and it retains most of it's original barrel finish, and about 70% case colors on the receiver too! It was much more affordable than a repro, and it has some history too! The best of both!