In his position, I would not go to any local antique gun dealer, and specifically would not go to a general antique dealer. He would probably not get 10 cents on the dollar of actual value. Nor should he try to sell through an on-line auction unless he can get precise appraisals and knows exactly what he has and what it is worth.
Tell him to contact several of the big gun auction houses like:
Rock Island Auction Co. (RIA) -
[email protected]
Amoskeag -
www.amoskeagauction.com
James D. Julia -
www.jamesdjulia.com
There are others which do not have web sites. There are also nationally recognized dealers who will buy outright, but IMHO a good auction house with nationwide sales is the best way to sell those kinds of items.
One way to get more names is to get copies of the NRA collectors' magazine, Man at Arms (54 East School St., Woonsocket, RI 02895), and The Gun Report (110 S. College Ave., Aledo, IL 61231. Both sell single copies. They have numerous ads for antique gun dealers and gun auction houses.
Best of luck to him.
Jim