Lots and lots of good advice here....As a MOAB (Man On A Budget) myself, I can appreciate the desire to own a thing of useful beauty. Before your friend does anything else, he ought to do 3 things, 1) read as much of the threads on this site as possible, and 2) order some back issues of the Double Gun Journal and 3) figure out why he wants to collect older American doubles.
In my case it was due to my duck hunting obsession.
I had a subscription to the DGJ for a couple of years before buying my first Rem 1894 10 ga. I knew that doing so would obligate me to low pressure shells. In other words I went into that purchase with eyes wide open as to it's feeding requirements.
He can't do too much research....
John
