What Do We Have Here?

[Aerobots]

Found this at my grandpa's old cabin, and I had a few questions so I came here for help.

https://ibb.co/Jx5Y5W2
https://ibb.co/N7YqdPs
https://ibb.co/sySBnpg
https://ibb.co/h1rHpJS
https://ibb.co/GPcLydT
https://ibb.co/3WLnjyj

1. What is this? I think it might be a Bridesburg.
2. Is it worth anything?
3. If so, how can I sell it?

Any help or guidance is genuinely appreciated.

 

[tiriaq]

You have the remains of a US Model 1863 rifled musket.
The barrel and stock have been cut down.
Does the barrel have rifling, or has it been smoothbored to turn it into a shotgun? Many were.
It has nominal value.
You cannot advertise it here until you have applied for and received access to the Equipment Exchange.

 

[maple_leaf_eh]

I think it is a muzzle loading blackpowder cap-fired shotgun. After that I don't know.