Ah, it's you again. Decided to hang on tight to me then, ye? Bloody awesome. I need to stir up some movement in our region. All sorts of outsiders keep popping up meddling with business, shoot, loot valuables off my guys, whack them indiscriminately. That makes me kinda unhappy, so to say, and it does not fall in line with my business concept. And to make it clear that they're in deep shit, fuck them up with pistols, let them understand that the pros are working. Well, go on and rake them "operators" of yours, and I’ll pay the bounty for each head, and even something extra as a present on top. Times are hard, and you have to make a living here somehow - preferably a good one.
A reliable alternative would be to prepare an ambush with a pistol shooting RIP ammunition. Hitting 5 shots onto the legs are sure to bring any player down (as it can equip a Stock, a GLOCK 18 might be particularly suited for this play style).
Killing teammates does not count towards the quest.