My Thunderbolt. Pretty simple upgrade. 2 SSRM 2s with 1 ton of ammo, 14 Double Heatsinks, and Endo-Steel allow you to add an AC/5 with 4 tons of ammo as well as a CASE in each torso. Still tweeking it a bit, might move the AC ammo into the legs and the SSRM ammo to the head so I can remove the CASE and put on another DHS. In-game heat efficiency is around 1.2 so I wouldn't recommend using an ER Large unless you don't mind running hot. If you don't mind sacrificing a ton of ammo you can also upgrade the AC/5 to an ultra model but I'm not fond of how often it seems to jam on me.
