This is by no means the best build, but it's certainly something that I'm having fun with.

A few questions I got asked while talking about this build

Q: Why not use Tremor instead for the grip?
A: Because can you imagine how bad everything smells? Infested are rotting flesh, Corpus are wage slaves that LIVE at work, and the Grineer... well quite frankly they just stink.

Q: Okaaay... why not use [Sinister Reach]?
A: Because I like seeing red crits, and I'm always worried I'll run out of ammo... and that's what the Brash grip is for.

After the first kill, Primary Merciless and [Galvanized Chamber] both proc, increasing damage, but that's the obvious parts, so in steel path, just gotta get that first kill, and your damage will increase dramatically, so don't be afraid to soften em up with abilities or running [Corrosive Projection].

The Residual can be changed or dropped entirely depending on your preferences, and the primary merciless isn't core to the build, but it helps a hell of a lot.

This is actually a 5 forma build because of course it is. To fit a full rank riven requires all forma and should replace [Vigilante Armaments] if it has crit chance, and [Vile Acceleration] otherwise.

Major edit 1: This build took a MASSIVE turn when (with the help of a friend) it came to my knowledge that beam weapons that arc have a tendency to proc headshot effects, so say hello to [Argon Scope]. Originally I thought I could use Primary Deadhead and [Galvanized Scope], but the kills that happen are 90% kills, but only incidental headshot kills don't help all too well.

Major Edit 2: Replaced the Pax with Pax Charge after finally learning what it really does, AKA, turns the gun into a battery-operated one. I have also replaced [Bladed Rounds] with [Hunter Munitions], which says it lowers the damage, but it cuts the TTK by almost half against level 155 enemies.

Edit 3: Okay, so last edit hopefully, but [Argon Scope] was not proving as much an upgrade as I hoped, so it's being swapped by [Bladed Rounds] and dropping [Vigilante Supplies] as it serves no purpose in the build other than a 5% increase in damage sometimes. Also throwing [Sinister Reach] on this for the sheer giggle factor.