Those look good (expensive though!) but I don't know which to order, Pietta or Uberti. Just go by cylinder length?
You can get around the bore size problem in the 38 by loading HBWC bullets and fast or black power. I shoot these in my origional conversions most of the time as they are easier to make than heeled cartridges.I have read the 44 conversions to 45 are more accurate than the 36 converted to 38 due to the bore size being closer for BP and cartridge. I just don't know what gun to get one for, the 1851 in .38 or the 1858 in .45. I reload for both.
Just the cylinder is already more than I paid for the revolver! That's OK though. Thanks for the conformation it's Uberti.2nd gen Colts were rough parts from Uberti milled and finished for Colt so order a conversion cylinder for Uberti. I don't think there is much if any difference between Kirst (Think Taylor's sales) or Howell. You may or may not need it timed. You can find used open tops about as cheap as doing the complet conversion. If you are just doing the cylinder that is cheaper.