https://dl.dropboxusercontent.com/u/600721/UH-1HSA18.acmi
That's a Tacview of an AI UH-1H, invulnerable, set to threat ignoring for demonstration purposes vs a SA-18 MANPAD. THe MANPAD keeps pumping out shots. In 6 mins he shot 20 times at the chopper.
For reference, in the days of times past, a MANPAD typically was a 2 shot unit that would have to rearm itself after. I believe the current state of MANPADS ammunition to be excessive and possible needs attention.
EDIT: If this has been covered before I haven't seen it. I took a quick look around.