Try to kill them. From what is heard, these are the auto-ban systems used for Nexon to remove OPK'ers. Although this is only said by my friend, it's plausible.
Nahh they don't die and you don't get autobanned from them.
I shot all my G36E ammo on 1 at two towers above the crane and it didn't die. It's just a copy of your character in-game with a gun like in the shop. Notice it has the gear YOU have currently on. I think Nexon just failed. As usual.