Low cooldown for the AC2 is great for suppression while you roll around with your team. Primary damage comes from the MLs, but the AC2 is a nice addition, especially at range. No special skills here, just all of survivability and the usual operations and sensors. Aim for magazine and cooldown skills last. I lost my AC2 arm with 190 rounds left, so this was pretty much all MLs. Isn't fully skilled yet so I don't have anything in firepower.