Don't expect to get much for used guns. Remeber they have to resell it at a profit, and customers aren't willing to pay much for a used gun.
Guns yes, ammo no
What kind of ammo?
Some guns. No ammo
They will buy some guns, but no store is going to buy ammo due to the inability to resale because they have no idea how they have been stored etc...
Guns yes but I do not know of any place that buys ammo. Best place to sell ammo is online or go to a local gun club like gateway. If the price is right you could sell it to a shooter or post an add.
Guns yes
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