Both has been instructed to assassinate one another but all they know is the Code name of their target and their Agency that they work for. They also know that they are being targeted by their target (Targception :P) They both have unlimited prep time until one of then decides to strike. (They do not know each others face btw)
All in their arsenal is permitted and no Help from others.
Time : Infinite
Place : UK (United Kingdom)
Both are inside a bar and both see each other at the same time. Both fully equipped whit their arsenal a gun fight breaks loose. Who wins? (No gadgets)