I've been tinkering with this for a while, always fighting against heat problems. Today I dropped the third RAC in favor of a 4th AC2, and Voila! This thing is a beast! With both magazine nodes, AC2 ammo is 618, and RAC2 ammo is 1230, which both run out around the same time. Weapon Group 1: The RAC's. Weapon Group 2: All AC2's Weapon Group 3: The lasers Weapon Group 4: The Arm AC2's only.