What the DPS dosen't show you is that this shotgun has unlimited punch through for bodies.

The survival tile set on the Kuva fortress has long passageways, effectively turning the place into a funnel of death.

The armor reduction will leave them at 10% starting armor, allowing you to gain the ELEMENTAL DAMAGE BONUS to thy type of armor they have .
+75% to alloy - radiation
+25 to flesh - heat
+75% to ferrite - corrosive
(And +25% to Machinery - impact)

As of the writing this Gavanized savvy has no limit to conditions that will provide the extra 80%. A primer to spread additional status like viral, electricity etc...

The extra range will put this weapons range to just over ### 32m. (20m normally)
/The Gavanized acceleration would have so few ranks on it the range would only be 28m don't use./

Would recommend running Shotgun AM if you don't have a rounded gameplay and are relying more on your primary.

A riven mod is just extra, but any of the positive effects it offers is fine to replace the riven to the normal mod (tweak to your play style ) .
The setup would prefer a heat mod for the armor strip.

Deadhead is personal preference, extra damage when landing head shots also improves DPS ,and is the fastest to hit the 360% only needed 3 and having a 24 sec up time.