imho, could be no other action then this we talking about...
so I was right with my theory about a short, intermediate and long action for the patent rifle

no, dont look for the german patent but must be easy to find if Schmidt is right in his book with the "23. Februar 1874" for the patent action and the "28. august 1875" for the rifling insert or "Rotationsstück". the idea of a short rifled part to convert smoothbore muskets was old than and coming from his father. I understand that this patent was for an exchangable insert what in the end means that sporting guns with "Rotationsstück" were made after august 1875.

btw cwilson, dont forget your beautyful double rifle

when we talking again about the double guns there is an interesting pinfire in auction in denmark just now http://www.lauritz.com/de/auktion/jagtge...asmus/i3635263/

its the first pinfire double I have seen with barrel swing out to like a dreyse.
I would set it in the time before 1864