Assassin Pistol
This is a pistol with a zoom function instead of a flashlight, and also seems to be more powerful. It is a good substitute for a sniper rifle. It is inside the Nine Worlds Tavern in Trier Germany. Once inside, there is a part where you will see stairs that lead up to a closed door and down into a bar. Go up, pick the lock, and enter. You will meet the Omar here if you can find their contact. In one of the corners under some junk (you must throw it around as it hides the stash), you will find the weapon along with some other assorted items.