I've observed some folks who were very concerned about being 'cheated' or, 'getting the true value' out of things they wanted to sell. The result: they never sold anything. Whenever I've sold anything, whether it be houses or garden hoses, I priced my items to sell and kept reducing the price until the sale was made....period. Most people can't or won't do this. If you are like most, I would suggest that you put them on consignment with a reputable national (gun) auction house, pay the price and get them off your mind and out of your hands... DONE. No more worrying about "am I getting cheated/do I need to do more reseach".... You will know what the market actually paid for your valued items; and whatever you get after commissions is the price you pay for a service that takes a burden off your mind.
IMHO of course,
J.