I think he is talking about the 1873 rifle.
There was some discussion of this over on the SASS Wire a few weeks ago. Unlike here in the USA, Italian guns must be proofed in a government proof house, so if Uberti is making a 1873 chambered for 44 Mag it has to have passed a proof test for 44 Mag. That means it is strong enough to take the cartridge. However, proofed for the round, and being able to take a constant diet of it are two different things. A friend of mine bought a used 1873 chambered for 357 Mag a few years ago, but returned it when he discovered a hairline crack in the frame. Personally, I would be leery of buying a toggle link rifle chambered for 44 Mag. I doubt if it would stand up to a constant diet of pounding from the round.