Any players who want to finish the Week 7 Challenges in Modern Warfare 3 will need to equip the AOK 4.0x RQ-9 Recon on a recommended weapon. Of course, that can easily get confusing without a better description, which I can help with in my guide.
How to Get Kills with the AOK 4.0x RQ-9 Recon Equipped in MW3
You can equip the AOK 4.0x RQ-9 Recon in the optic slot for most ranged weapons such as assault rifles and marksman rifles. This sight looks similar to the classic ACOG from previous COD games. It has the red arrow directly in the center with a 4.0x zoom for a bit of extra range. Personally, I hate the arrow optics but it’s required for the challenge.