First of all, if you have a riven mod,switch out [Vital Sense].
TL;DR,[Hunter Munitions] were such a great mod on this sort of build as it provides an absurd amount of slash damage on crit,while vigilante supplies keeps your hard-to-found sniper ammo storages high,it also has a slight chance of enhancing your crit,thus more damage.
The base stats allow us to build both crit and status as chakkhurr is fairly decent with 50%Crit and 27%Status at base.

So here's why;
-galvanized aptitude provide you extra status and damage since it has an unique,condition overload-esuqe perk so it is very suitable for our build.
-[Galvanized Chamber] provide you extra multishots,at max,this mod alone with grant you 2.3 multishot,good enough to decimate most steel path enemies
-serration for base damage
-hunter munitions for the sweet,sweet slash
-rime rounds for combining viral(as my chakkhurr is toxin)
-critical delay,hammer shot and vital sence for crit chance and crit damage
-[Vigilante Supplies] for ammo restoration and crit enhancing

Further more,since it was a kuva weapon,the elements was actually very flexable,if you got a 60% cold,put [Malignant Force] to combine viral,but i mostly suggest toxin as it provides the most flexability(+cold=viral,+electricity=corrosive).Finally,feel free to switch primary deadhead for merciless if you were a bad aimer like me~