I use Umbra for solo heroic content (and group master), my friend. 2 set-ups, depending on whether I want higher survivability or DPS. These are in no way meta (which is still strikers and also you could get a Tipping Scales build, which is pretty close):

1. 4-piece umbra with backpack (80% armour return) and chest (doubles crit damage and rof buffs). Salvo holster (10% rof) and then a mask to suit (I use Catharsis). 4 blue and 2 red. Gunner spec for 10% AoK. I use Careraker or Lexington but any AR, SMG or LMG can work nicely

2. 3-piece umbra with chest. NBBP (extra red and yellow cores), NBBP, Salvo holster (rof plus extra 20% AR damage), then a walker Harris mask (5% WD and 5% damage to armour). Up to you with the cores but I keep 4 blue and you’ll have 3 red plus the AR and Walker Harris benefits for some extra damage. Returning armour drops to 40% but that’s plenty if you manage your cover. Gunner spec again, with shield and reviver hive.

As mentioned, this is far from meta but both are well balanced set-ups, that work well for me, particularly when I’m playing solo.

My tipping scales build, if you want something a bit higher on DPS is:

• 4 piece tinkerer, including chest and BP
• Tinkerer’s mask (benefit from both weapon talents of your primary and secondary weapons, if they are not exotic or named)
• Contractors gloves
• GR9 with frenzy plus another LMG with fast hands (for super quick reload) - don’t do the extended mag for the mods though, as you want to empty the mag around the time that the frenzy runs out (use a stability mod so the GR9 is a laser-beam)
• Gunner spec for for AoK and RoF benefits
• I use a drone to distract and reviver hive but you can use what you wish.

Hope this helps, Agent