Most certainly one could do that Dave . However if it were me doing the work , I would want to see what the deal is with how the drilling was done on the right barrel and exactly what was done with the hooks
As to the age of the barrels ?? By the proof marks , since there is no Crown on the prudential mark “LEG” has no crown , that should place it prior to 1893 . That however does not mean that’s when the gun was made . a lot of these barrels were imported and even more of them stored . As warehouses were found or bought up , cheaper guns were made from them and then marketed .
The other thing that could have happened is that someone bought an older piece and then restocked it . Very hard IMO to say unless you find those hash marks and slash on the stock . Which could be under the butt plate , under the barrels or under the TG on the wood
Here is a link for you to look up the markings .
http://shotguns.se/html/belgium.html
Also here is some originals for you to see the breech lines I was speaking of.
common Belgium
Early french flintlock
English flintlock
