Heat Build Approach -> INSANE HEAT DoT

Armor strip + viral amplification allows large heat bleeds along with decent CC. Very good anti-grineer weapon (or infested).
Riven is pretty flexible (+mag, or classic buffs), I only modded the minimal +heat here. I highly recommend punch-through + beam length to freely swing around a laser of destruction.

Flexible polarities with other builds such as Galvanized Savvy, Toxin/Viral-build, or crit mods.