Conversion question about Pietta 1858 Rem

[ChasMack]

I was looking over past posts and want to be clear about getting a conversion cylinder for my Pietta 1858 Remington. Do either the Howell or Kirst cylinders require fitting? It seems some do some don't. I'd like to switch back and forth so I don't want to alter the frame. So which one requires less fitting if any?

 

[hang fire]

My Kirst required very minor stoning of small raised protrusions on outer edges(is designed for such) of the bottom flat on back up plate. Said flat can be seen in pics . Kirst supplies clear insrtuctions for doing so if required and it is no big deal,

 

[Hoof Hearted]

The Kirst should drop right in without any worries.........

Regards, HH