My MP-15T. I have an Eotech 557.AR223 on the way this week and a Mako Foregrip/Bipod! I'm such a lucky guy!
-Marcos
P.S. The pistol's a Sig 226R, the vest is a Blackhawk Omega Crossdraw that holds 6 30rd Pmags and 4 pistol mags, and the knife is my trusty 'ol Ka-bar.