A rather simple build simply aimed at one thing: Doing as much damage as possible, and still tanking everything they can throw at you.
The banshee pieces are aimed at the 10% out of cover damage, a lovely multiplicative modifier (Which division builds doesn't list in the dps calculations?), which is a pretty substantial DPS boost, putting you in the 500k range.
Normally people use recon pack instead of a med station if they want full damage, but precision grants you 12.5 CHC on headshot, which in my experience is quite easy to proc within responsive range, giving you 51.5% CHC, 8.5% off from the max, so I opt to go for a medstation for extra tankiness.
Shields have 10% damage bonus to start, and the shield damage mods give you 16% more damage, which is a rather solid base modifier.
As a note, the pistol should be at a lower gearscore so as to make use of the toxic and coolheaded talents.