My friend made a John Woo style pistol fighter. He took two of the Ruger Thunderbolts (the ones that burst fire like super machineguns, except with shorter bursts and no recoil first busrt), smartlinked them, put in a single shot micro-grenade launcher in the underbarrel slot, and focused his skill (in 3rd edition, where the dice pools didn't get as big) so that he could fire each one with a 17+ dice pool for each gun.
He complained once, after downing two guys in really good armor with decent combat pools, that it took two bursts each to kill them instead of one...all in under 0.3 seconds (yes, we calculated that, he was that fast).