Go here and get this instead of a Pietta or Uberti. Get some Treso nipples for original Colts (made for #11 caps but my #10 Remington caps fit better) and you'll be good to go. If you have questions call Lodgewood - great people who know old iron. 1860 Army Colt Cylinder (Reproduction for Original)-#33 No engraving on cylinder and no nipples included.
Some Uberti 1861 Navy cylinders fit original 1861 Navy arbors/frames, but it's likely hit and miss, and miss again with production over the years, especially with the 1860 Army because of all the variants. The Lodgewood cylinder will fit.
Some Uberti 1861 Navy cylinders fit original 1861 Navy arbors/frames, but it's likely hit and miss, and miss again with production over the years, especially with the 1860 Army because of all the variants. The Lodgewood cylinder will fit.