This is an old thread that discusses Parker cape guns
https://doublegunshop.com/forums/ubb...81&type=thread
The gun shown clearly has a rifle barrel insert, which at the turn-of-the-century was a popular gunsmith modification.
There are a number of .45/70 gunsmith modified L.C. Smith guns
and
https://smith-wessonforum.com/thread...-rifle.678832/
We need full size high resolution images of the breech and muzzle ends of the barrels, and the barrel and action flats
If it is your gun it would definitely be worth requesting a Research Letter. Click on Research Letter on the Home Page
https://parkerguns.org/