[Amprex] is [Volt] as a weapon, basically electrocute everything with this, it works well for most Steel Path level Enemies. The more enemies are grouped the better it's DPS will be, since the Hits will arc from one enemy to the next, making it perfect for tight corridor fights and crowded missions.
While it has poor Burst DPS it does stun all enemies briefly due to its innate electricity.
This build is fairly lazy, no Bane mods, no [Bladed Rounds] or other mods that might give you a few % extra, for extra effort, but I like a simple weapon that just works if you hold it into a group of enemies, also, best yet: It destroys Nullifier Shields with ease and while its not perfect against Eximus, if you keep firing at them for a bit, the viral+slash+electricity procs will take care of them within a second once their eximus shield is down.

Options

Galvanized Chamber can ofcourse be replaced with Split Chamber can be exchanged for Hammer Shot, Bladed Rounds or even Vigilante Armaments should ideally be replaced with a Bane mod of your choice to maximize damage
Sinister Reach can be replaced with Vigilante Supplies or Twitch depending on preference.

Riven

The Riven should replace either Malignant Force or Serration (or the Bane mods), depending on preference Hunter Munitions might als be a good replacement option.
Best Stats:
+critdmg > +multi > +critchance > +firerate > +element > +dmg

Arcanes

Primary Merciless is the only real option for Primary Arcanes
Arcane Acceleration basically provides free 90% fire rate increase
Theorem Demulcent can also further increase DPS but is really only viable during stationary missions like Defense