Hi Bob,
There may be a name on the bottom of the barrel. There also may be the barrel maker's stamp as well. Common barrel makers in the US that stamp their work would include: Getz, Rice, Green Mountain, Colerain, Douglas, and Rayl, There are others but those are the most common over the last 30 years. Hopefully, the gun maker signed the work somewhere. Give your post some time because someone here may eventually recognize the gun. What is the significance of your title "D Boery 1771"? Is that written on the gun somewhare?
dave