Intro

Build aims to make good use of both the high status automatic mode and the high crit charge mode. Above configuration allows armour stripping at a distance with auto mode and charged hits for the kill. Feels like an overall slower [Fulmin] but without having to wait for an animation to switch between firing modes.

Essential

Serration
Split Chamber
Point Strike
Vital Sense
Vile Acceleration - Damage penalty outweighed by much higher fire rate boost than alternatives.

Elemental Mods

One 90% elemental and one 60/60 mod - Polarity configuration allows any Primary or Secondary elemental damage in two slots. At least one 60/60 mod is recommended to take advantage of the high status chance in auto mode. [Primed Cryo Rounds] is a 30% increase to damage if it replaces the 90% mod, but will require an extra Forma and the build will be left with an inflexible Vazarin slot.

Final Slot

Primed Fast Hands - Reload speed is slow even with this. Gun is painful to use without.

Alternatives

If reload speed is not an issue, Primed Fast Hands can be replaced for more damage
Heavy Caliber - mods can reconfigured to allow Heavy Caliber for a considerable damage boost (~62%) with accuracy penalty
Bladed Rounds - Similar level of damage boosting (~55%) to Heavy Caliber but requires aiming and steady kills
90% Elemental Mod - Damage increase (~36%) with no drawbacks. Also can be used to increase proportion of Corrosive damage for more desirable procs.

Exilus

Terminal Velocity - Improves fall-off range in charge mode. Actually a fairly significant increase to realistic damage dealt as minimum fall-off range is only 9m.
Ammo Mutation - This gun is ammo hungry but this will require another Forma.