selling most anything is like selling your car. If you have the time to waste selling the item, you should do so in the classified section of any major forum, this forum in particular is a great place to start.
If you don't want to deal with the headache, give it to a pawn shop or dealer, but keep in mind, they're never going to give you what it's worth - they are in the business of making money, like everyone else.
It's purely a decision based on how much time/energy you have for the sale, and whether or not your time/energy is worth the money you'll save by selling it privately.
I don't know much about these guns in particular, but I'd expect at least a difference of 50-150 between the private party sale and what a shop may offer you, for what it's worth (purely speculation).