Questions again. :D
1) Conversation below.
"Just answer one question, no bullshit. You didn't switch that diamond, did you?" She asked
"You wired?" He answered with a grin.
"Damnit, Pete"
"No, I didn't switch the diamond."

What does "You wired?" in below conversation mean?
2) "
There’s something to be said for the fact it saw a little action." What does this exactly mean?
3) Conversation below.
A: I have a couple of trucks and one of the first model air-buses. Bunged up pretty bad, but sentimental value there.
B:
Might as well get the full effect. 
What does "Might as well get the full effect" mean?
4) Pls explain.
I can't imagine just shrugging it off if I knew he was going to kick. Pretty young for
taking the slide, isn't he? Can't have hit even seventy yet. Guy's just
cruising into his prime.

What does "taking the slide" here mean?

What doesn "cruising into his prime" mean?
5) We've got a civilian
in the crosshair.

What doesn "in the crosshair" mean?
6) When you say a man is
poster boy look, it's mostly positive, right? I mean that man is pretty handsome, right? Have any negative meaning??
Thank you! :D