there were italian copies of the 1876, but they were a crap shoot as to quality. i think a older used marlin 95 (45-70) could be rebarreled. i own and shoot a original winchester 1876 in 45-60 that was made in 1883 and enjoy it shooting it with cast bullets, i use no jacketed bullets as the steel then was not as strong as todays steel. eastbank.
The Italian 1876's that were a crap shoot were made by Chaparral which was imported by Interarms. They tried to enter the cowboy action market back in 2010, but the quality of their initial offering of centennials was all over the place. They also produced 73's, steel framed 1866's, and SSA's. Their quality began to improve, but it was too late and they were not able to overcome the first impressions people got---especially those who got stuck with lemons.
Interarms stopped importing them and I think the remaining stock got bought out by some Canadian firm. They still pop up from time to time on GB.com.
On the other hand Uberti also introduced a 76 about the same time. There were a few minor issues at first, but Uberti corrected them quickly and replaced any that couldn't be fixed. I don't think there is or was a huge demand, but they still list them on their web site.
They make a 45-60, a 45-75, and a 45-95, which were the main calibers that Winchester initially offered. MSRP is around $1600.
I happened to get one of the late made Chaparral's on closeout in 45-60 from a surplus dealer out of Texas. I've had no issues with it what so ever. Considering I only paid $600 for it new in the box, it turned out to be well worth the gamble.
Cheers