Armored suburbans, Background info, please Options

[Wounded Ronin]

Recently, we just got an armored chevy suburban out here in the FSM. It's pretty absurd since nobody out here would try and shoot us, but I guess it's a broader initiative which must be affecting federal agencies as a whole.

Anyway, I asked an administrator what the NIJ rating of the armored suburban was, and he couldn't tell me. I realized at that point that "armored suburban" is something of a cliche and almost certainly must appear in any RPG setting where the FBI is being represented.

So, 2 questions:

1.) In real life, what degree of protection does an armored suburban provide against firearms?

2.) If you had to run a SR campaign with FBI agents how would you statistically represent a sterotypical armored suburban?