You know i think this blog has it right - it's not the weapons per se that matter - this isn't like a Guns&Ammo porn fetish.
You see I love hot shiny oiled bodaciousness... but I don't love guns, or know guns...
What it says about the fact that these are girls in action is what makes sense to me: action jumping running blowing up swimming working out etc... it's not *** type, caliber, etc...
It's powerful, potent women of action who look as good as they DO...