Neat old rifle...

[ChrisK]

There are inner magazine tubes available for your rifle. They are not inexpensive but your rifle sells for between $4000 to $6000 at auction from what I’m finding.

 

[Mongo59]

Here is a pic of the one I measured the magazine from. wish it were mine.
View attachment 348992

That is sweet. Deluxing back in the 1800"s!