On some forum last year, I exchanged a PM with a fellow who has an iron carbine on special order. I think it was Taylor's who had placed an order for 5 some time before covid hit, so they were not yet done. They were, though, in 45, not 44.
I handled a brass one at Taylor's last winter. They handle a little better than the 24" but they do look sawn off. I think Uberti should have used 20". The Winchester Book shows a 19" but he didn't know if it was a factory job. There is one 20" which Madis felt sure was factory.