Santa Barbra is a Spanish arns maker, they supply all of Spains Military, arms, they made the 58 Remy up to about 20 years ago. I understand that they are the quality of Uberti and some had Walther BBLs. They and Euroarms are the only ones that make a copy of the Remy Old Model Army (no threads showing at the breech). I suspect that R & D and Kirst Uberti Conversion cvylinder will fit, but do not hold me to that. If your cylinder is 2.00 in length then it's a safe bet.