I believe you are referring to this revolver and conversion cylinder:
View attachment 860667
https://www.emf-company.com/store/pc/1863-Models-c113.htm
https://www.midwayusa.com/product/101678791
My thoughts: I don't care for spur trigger guns. $600+ just to plink with .32 S&W ammunition seems to be much more than I would spend. These little guns seem to get lost in my hand.
Be advised that the cylinder seems to work well with the steel frame revolvers, but the arbor on the brass frame versions seems to be a bit larger in diameter than the cylinder arbor hole (read the fourth review on the Midway site).
Regards,
Jim