When missiles and bullets COLLIDE!, A question for people who know guns Options

[nezumi]

Alright, a quick question I'm not sure how to address...

A player plans on spraying a GMC banshee with his ingram valiant (loading EX Explosive rounds). Knowing the banshee is armored to no end (how does something with that much armor fly again??), he's calling shots on the front turret and the side loaded missiles.

So what happens when a missile or rocket (or grenade, for that matter) is sprayed with automatic fire, especially when using explosive bullets? I assume missiles have something to prevent them from going off accidentally, which means they're inert until active. I also assume the missile doesn't have any ammo worth mentioning. So the bullet spray would simply destroy tracking computers and firing pins in the nose of the missile, and otherwise make it non-aerodynamic and unworthy of flight. This means that, with sufficient machine gun fire, all the missiles will be incapacitated and the t-bird will be left with the nose turret only, but will otherwise be largely safe from anything the gunner might attempt to do.

Thoughts or comments on this? Am I completely misunderstanding the nature of explosives?