My Kuva Chakhurr build. The Element really doesn't matter, I found radiation the most useful one.
The Arcane slot can be anything, Deadhead is imo the most convenient one with this build. I would go for an Ammo mutation mod in the Exilus slot or [Ammo Drum].

When using this weapon, make sure to get the 360% Damage bonus from the Arcane and the additional 150% Multishot from [Galvanized Chamber]. After all, that's why trash units exist. Also, always go for the head of stronger units to take advantage of the Chakkhurr's additional 50% Headshot Efficiency.