gun bunny
Definition 1:
Some one who jumps at any opportunity to talk about, shoot, or show off their guns. Commonly owns several guns and a hundred issues of various gun magazines.

Also anyone who talks knowingly about any gun related issue.

Definition 2:
A girl who is strongly attracted to, or excited by, guns. A girl who likes shooting many kinds of guns. Similar to a ski bunny in the shooting world.
example 1:
Dude, I'm not sure if I wanna get a glock or an H&K.

Ask Nick, he's a total gun bunny.

example 2:
Jessica is gonna come shooting with us tomorrow.

Nice, she super hot, and a full blown gun bunny.