Well....it won't be original so you'll have to represent it as restored. There aren't a lot of Borchardt around so it could well be worth it. I'm unaware of any over the shelf parts available for an 1878. I have the Sharps book in my library, let me browse through it tonight and see what I find regarding calibers and such.
Shiloh and/or C. Sharps does restorations I believe. It won't be inexpensive.
Shiloh and/or C. Sharps does restorations I believe. It won't be inexpensive.