Ponder this-
Ted frequently remarks about Darnes (I have none) having very heavy barrels in order to manage balance and recoil.
If a person had an interest, these barrels might be excellent for learning to strike, and actually might be useable.
Secondarily, the stock would need to be replaced. Most would say it was not worth the money, and that all sliding breech shotguns are a bear to restock. Robert Chambers claimed vociferously, and ..amusingly, that they were not that hard to restock,and that he had done it economically. I think he even gave an inletted stock to someone.

So, purely for discussion, and in the interest of adding to the great pile of incomplete, clapped out, shotgun projects in the universe we share, I would have to say that if there was enough wall thickness, it might be made serviceable. I don't know why anyone would want to expend that much file time to create a field grade Darne, but heck, there's a black guy in the whitehouse, and he isn't the cook.
I don't know why anyone would want to, but as a learning tool, if the wall thickness was as Ted has described, it would have plenty of meat to file.


Out there doing it best I can.