Well, when I'm at work, I carry an FN made M-4 assault rifle with an Aimpoint M-68 close quarters optic with 210 rounds total of 5.56mm M855 ammunition. I also carry a standard M-9 pistol as backup with 45 rounds of standard 9mm ball ammunition.
Granted there can be special circumstances at work where I may carry an M240B support weapon with anywhere from 500 to 5000 rounds (kinda heavy, though...lol).
M240s are dead sexy weapons...yeah, baby, yeah!!!!!!!!!!!!!!!!!
I'm still trying to decide what to carry off duty...lol. I'm in the market for a good small, simple pistol, and I may purchase one of the KEL-TEC or Ruger .380s. I'm still waiting for a good deal (and some spare money) to come along.