This is the imrichking's Hexa-MLas-Megaburn with Crit-Strike-Pump Edition. 19 DHS for decent Cooling. May the Pumpkinhead bless you on Halloween! Alternate cooler version: Blagg
I ran it for a handful of matches, and this build is just way to hot to be competitive. Aside from the LB, everything is happening under 300 Meters, so you don't have time to sit back cool down. The LB and MPLs are great on Lights up close, but on maps like Terra Therma, you are either limiting yourself to half of your weapons, or are just watching the action swirl around you. Unless you can reach out and touch people, a build with a cooling efficiency in the low 30 percentile range won't be practical.
I grouped them by arm, and ran it a couple of different ways. I tried chain firing each group, or firing each group of 3 separately. I also tried putting them all in one group and chain firing them so they'd all go off in a three second cycle, but it wasn't practical. What it boiled down to is that the weapons are most effective when someone is in your face, but the heat is just too unmanageable.
Dropping Endo, a ton of LB ammo, and swapping the MPLs for MLs allows you to add a couple of extra heat sinks in exchange for a lower alpha. It's a lot more manageable, and gives you a little bit of extra range. If you need more than 60 LB ammo, you can always drop a HS for it. *Edited a couple of typos and fixed the link.
i like your Tweak so much, that i changed the OP-Build to yours. Always glad if people can make it better than i can.
Thanks! I keep flipping back and forth between the build listed above, and swapping out the LB and SRM for an AC/20. They're both equally effective and it comes down to pinpoint damage vs. increasing crits and spreading your shot to swat away lights.
I just fixed my original link. For some reason the SRM ammo was dropped off. I dropped a HS and a ton of LB for two tons of SRM. My apologies.