[smokelessjoe]

Thanks guys - Already gave me a few ideas that I had not thought of before.

To give you guys an idea of how far I have taken my research... I found a Gun Forum and asked them about the photo! See one of the responses below:

That appears to be a Stevens Tip Up. Also known as a "pocket rifle".
They had removable shoulder stocks, so they could be used as a rifle or a pistol. Various versions were made, including some shotguns, from 1886 to 1916.