This is a 'Paragon Build'. A cheesy, stupid, self coined term that refers to a build that achieves the highest mathematically possible DPS or per-shot damage possible, given a few conditions. Basically, this is literally the best of the best, barring outside buffs or specialization.

If you don't want [Hunter Munitions], replace it with [Serration] or [Heavy Caliber].
If you don't have or don't want to use Bane mods, then replace it with [Serration] of [Heavy Caliber].
If you don't want Bane mods or [Hunter Munitions], then replace both with [Serration] and a 90% elemental mod.

As always, you should use a [Furax] with [Amalgam Furax Body Count] to increase the blast radius. It affects the following weapons and all of their variants:
[Ignis]
[Gaze] (Kitgun, only as a primary)
Javlok
Ogris
Penta
Scourge
Simulor
Tenet Envoy
Tonkor
Torid
Zarr

Conditions of this build:

-Must have Primed Firestorm
-Only allowed conditional is On Kill.
-Cannot use Galvanized Aptitude
-Built for maximum per-shot damage

Why [Primed Firestorm]? The increased radius means that enemies within the radius take more damage over a wider area than without the mod. Effectively increasing the base damage for enemies not exactly in the center of the explosion.
Why no headshots? Good luck hitting headshots reliably with this thing. No remote detonation.
Why no Galvanized Aptitude? Because Galvanized Aptitude only works on direct damage, not AOE.
Why maximum per-shot damage? Seems more appropriate.