I recommend the M6A2-SRT + TPG-1 (If you snipe) + Skorpion mod.
M6A2 as your AR, it's obvious what the TPG is for, and the Skorp mod to replace most SMG's (Unless you prefer P90TR). Skorp mod beats T-2, and the spread is 10x more effective getting LEGIT headshots.
I do not recommend the T-2, I have it perm, it's basically a rapid firing AR, rofl.
Also, a shotty would help too, I recommend the Double barrel punisher; I play a 2.32 KDR (Completely legit) using T-2/TPG-1 Pro/DB punisher.