Part of your action plan would also depend on the volume. A handful of guns can be unloaded through various means - local auctions, online auction sites, gun shows, forum classifieds, give to deserving heirs or non-heirs, etc. If you have, say, 500 or 1000 guns or more, and an equivalent volume of all the other stuff that goes with it, you're going to need a higher volume solution. Even if you pay an auction house (that specializes in guns) a substantial commission, you or your estate might net more than if it all gets dumped onto an heir who knows nothing about most of it, especially if you have any stuff that's special or of particular value.