By doing them one at a time you won't pick up a gun and have it turn into ammo, which is worth crap compared to the gun. When I kill anyone who drops a gun in Detroit, or any area that has a vendor nearby, I will literally run each gun one by one back to a vendor. Selling guns in this game is kind of silly, but if you do it right you can make a lot of credits early on. I almost have 1 of every weapon laying around the joint. I like to use the apartment as a weapons locker.
