First, welcome to the site.
I hope you find what you're looking for.


Now -- you need to give much much more information about what you have here if you want to get a meaningful response.
Also, you need to get some photos of the gun/rifle up here for us to see and evaluate.
The more detail the better, especially photos of the proof marks and other stamping/engraving on the metal.




Cheers
Tinker