It seems that when pulling the trigger, or depressing the pickle button that there should be an audio tone to go with the action.
Here are three videos showing this audio tone/ping
Air to Air Aim-9, CCIP, Guns: http://www.youtube.com/watch?v=2TyunFbfpXM&feature=related
Maverick:
Air to Air Guns:
Could this be implemented? It would be amazing and simple to do!
Regards, Diego