He's right. I use the claymores, stopping power, and deep impact for normal games and its a 1 hit with the M40A3. If you want to have a one hit without stopping power, go do hardcore lol. Everything is a one shot... I shot a man in the foot and he keeled over.

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Light a man a fire and you keep him warm for a day.
Light a man on fire and you keep him warm forever