In addition, the 2 damage at a time means that the damage will be spread to some degree even with awesome aim. If the heat were cut in half, the AC2's heat would be in line with other ballistics.
The advantage would be high DPS for their weight, the disadvantages would be spread damage, no torso twisting while firing, and due to the spread damage, the ammo is in effect less efficient.
I still don't think that they'd be top tier, but they'd be solid middling range suppression and perhaps even brawler DPS if in the arm (as you could still torso twist some).
Edited by Egomane, 24 April 2014 - 05:47 AM.