Word of advice, if you are going to send your gun off to have the conversion cylinder installed by gunsmith, send it here.
This guy (Hoof Hearted on this forum) was trained by Kirst to install the cylinders.
From his site
Kirst Kartridge Converters
trained me to do their installations so I have LOTS of experience with their product.
He has done work for me and I am pleased. Plus he charges less than Kirst does.
Install Kirst Konverter: $80.00
includes port, finish, tune
(Compare at up to $125.00)
Kirst wants $125