your choice, but I would take the time to research some going prices on gunbroker, forum trader ads, and then part out the accessories if that is what it takes to max your return,
ad's on forum are easy, Gunbroker has a wider target audience, and is inexpensive,
for the parts/accessories that are scarce/uncommon, ebay is a good place to sell, however you would need to be able to stomach their policies, and they are more expensive than gunbroker etc etc,