thats looking very british to me, like for a Baker rifle bayonet.
I never see a needle fire double rifle, do you remeber the maker? when german make, it can be Dreyse, Teschner maybe Berger or Meffert.
I also never see a full rifled bore gun for needle fire cartridge#s but I believe that some build before 1870. Only very special v. Dreyse "Büchsflinten" combination guns on the market from time to time. I dont know if you have seen this before. It looks like a normal Side x Side shotgun but you can remove the chamber from the rigth barrel and put another bullet cartridge chamber into the barrel.
the bullet cartridge camber insert have a short rifled part and this correspond with the smoth shotgun barrel. you can say that this is a upside down paradox system. I think having some pics here laying arround.
MEHUL something is coming

And for the drinks, I am more the port wine man.
Maybe we meet together before in Villa Nova de Gaya, this is a very important part of Porto. I will show you than whats good for your

health