I can solve this tracers issue right now from personal experience.

You can see tracers coming towards you.
Example of this is hold a torch, turn it on, face it away from you. Can you still see the light flare at the base of the torch? Yes you can? Well imagine that torch to be a small blob of buring phosphorus, you will see it. You might not see every tracer but 1 out of 30 bangs home the message

The tracers will be good in COD.