Rather than follow the normal meta builds, I kinda pieced this one together on my own, thinking about my particular play style.
All three green pieces are HF, rolled for max 170k armor and max 12% CHD for the attribute. All gear mods are CHD mods between 11-12% or the one CHC at 6% in the chest.
You can see the chest, backpack and holster stats below, and my build stats at bottom. With the Cold Relations I am running almost 54% CHC and 148% CHD, and with the Scorpio 43% and 138%, respectively.
All pieces (including weapons) are fully optimized with the sole exception of the backpack, which is a recent addition (and I ran out of optimization mats). Once it's done I'll have another 1.4% CHC on all weapons and 2M armor.
I am not certain about the Opportunistic talent. It works on shotgun-only kills but the 5 seconds is nearly half over by the time I swap to another weapon. Still, it slays for up-close kills.
I also have fully optimized Lady Death and The Mop to swap out on the two primary weapons. I go back and forth trying to decide which I like better.
Oh, skills are Defender drone and shield, of course. With 0 skill tier both are incredibly weak though...