The location is in the the building where there is a big hole in the wall where the walls should meet; on the top floor. The hole is looking out towards the little huts with the mounted machine guns. If you are facing the hole in the wall, walk against the wall on the left and when you reach the edge of the ground, look down and you will see a small chunk of floor about five feet down maybe. If you crouch and turn around on this floor you should be able to see the lower level of the same building.
On top of this little chunk of floor is where my scope disappears. You may have to be in stealth for it to disappear I can't recall, but i don't think so. When I aim down the sight it zooms but the cross-hairs and outline of the scope are not there and I have to guess where the middle of my screen is. I never use my sniper class so this does not bug me though, just curious to see if other people experience this.