Optional: replace Magazine Warp w/ [Magnetic Capacity] for corpus faction << This buff is especially helpful if you want to kill enemies with overguard.
I use this weapon with this mod on my Caliban setup to proc this status more often as well as to supplement viral damage.
Replace bane mod for correct faction, if there is none then use bladed rounds.
Replace malignant force with correct damage type bonus against the faction you're facing.

Ideal Riven: Crit. damage / Proj. speed / Crit. chance/ -multishot or -reload speed or -ammo maximum.

This build is meant to be supplemented by Nourish so you don't need to mod for viral. Not having this subsume on this setup will make this build significantly weaker.
Using this weapon with a primer such as the Kompressa will make your single target damage sky high, being able to kill most things in the game extremely quickly. From my testing, it even does so much damage that it triggers the damage attenuation on Scaldra Decidants and Techrot Babau.

Unfortunately as of the most recent update Techrot Encore, multiplicative crit has been fixed and Primary/[Pistol Acuity] do not buff certain weapons' (like the [Basmu]) crit chance and headshot damage to the high heavens anymore, but this build is still strong after the fix.