This build is created for the toughest opponents, ex. Grineer (Bombard, Napalm, Nox, Heavy Gunner, etc.), also deals well with the hardest Plague, the Ancients or Corpus Bursas. The rest falls from just anything.
Why there is an Anemic Agility?
Well because of that Fire Rate bonus :)
So what? It takes 15% damage!!! Unacceptable!!!
OK, replace that mod with something else and see what happens. Pay attention to Burst DPS. Then we can talk! Yes, even when you add [Primed Heated Charge], and get more burst DPS... this build is simply the best you can currently make. And you can change elementals.
I've tested this build many times and saw results. Corrosive is simply the best elemental here. I compared it with Radiation and in most cases Corrosive was similar or better than Radiation.
What was weird... Nox. Lever 160 Nox died at least twice a time faster from corrosive than from Radiation, even if Radiation is his weakness. Why? Because Corrosive deals more and more damage every hit, while Radiation is flat.