This is an interesting CDV photo of a man with a rifle or a shotgun. This is probably from the 1870s-1880s, and it appears to have been taken outside, in a non-studio setting, which was unusual for portraits.
I can't tell what kind of weapon he has - I really, really want to say its a shotgun, but I just don't know. He's holding something in his right hand which could be shotgun shells, but it could be something else. He's dressed in what may be a rather snazzy hunting clothes, with plaid pants bloused into shiny boots, and a derby type hat.
The has been trimmed, so it is a little smaller than the standard CDV size. There is no photographer information or other writing, so there is no indication of who this or where this picture was made. I'm pretty confident of the time frame though.