For those who are having problems with this - reflections not working, then follow these steps.

1. Go to any map where the reflections are not working.
2. Bring up the console and type: "mat_specular 1" (without quotes).
3. If it doesn't work, then type: "buildcubemaps" (without quotes). Then repeat step 2.
4. If done correctly, the reflections will now show up on scopes.

If it happens again in the same map when next time you launch the game, then do the above again.