I have converted an Uberti remme with the R&D 45 colt drop in cylinder, and a Pietta remme with a 38 special Kirst Konverter.
I had to file a little on thr forcing cone of the Uberti to get thr R&D to fit. I think this is due to the Uberti being one of the Melennium models. I only had to remove about 1/32 of metal. The conversion works fine, and really shoots good.
The easiest conversion was the Kirst. The kirst differs in that it has only
ONE firing pin. Its also got a groove cut for the hand which makes removal and instalation no problem at all.
The benefit of the kirst is its a bit safer to handle when loaded and out of the gun. The R&D could easily discharge multiple times if dropped due to its exposed firning pins.
One word of advice, if considering a conversion, forget about the 36cal to 38 special conversions. Shooting hollwbased wads works but not very well. Helled bullets can work but are a mess to deal with. :banghead:
If you
MUST convert a 36, get the R&D gated cylinder, and send ithe gun to R&D to have the barrel sleeved to .357.
If you have a Kirst Konverted 36, I'm sorry but R&D wont sleeve your barrel.
Over all I love the Kirst product, fit and finish is awsome, and quality is top notch. Its also easier to use than the R&D.
The R&D however is more historically accurate, and is also a very good product. I have both and use both, and I may buy another R&D to save a few bucks.