This build is specifically for use in the INCARNOFF MODE for stacking heat status to deal damage. Critical chance mods are not used due to the weapons poor base crit stats which are not really compensated for by the available evolutions, assuming no outside factors such as warframe arcanes (e.g. avenger/velocity) or warframe abilities (e.g. flat crit boosts/fire rate boosts).

EVOLUTIONS

Evo 2: Hoplite Virtue is the superior option in most cases on frames with shields where you frequently take damage to break shields, but Paladin's Virtue is an acceptable alternative on frames that either have no shields or rarely take damage but have an energy pool > 700e.g. [Octavia Prime], [Ivara] and [Ivara Prime], [Limbo Prime], [Loki Prime], all using [Primed Flow] or [Archon Flow].

Evo 3: Either Moonrise Velocity or Resonant Restore

Evo 4: Elemental Balance +20%

MOD BREAKDOWN

Do NOT use [Galvanized Shot] unless you are using an external primer with tons of status effects. This is because you only have TWO status effects at base to power [Galvanized Shot] AND currently the damage bonus of galv shot ignore's the flat base dmg bonuses from Evolution 2.

[Galvanized Diffusion]: Compulsory multishot
[Lethal Torrent]: Compulsory more multishot and fire rate
[Pistol Elementalist]: multiplicative status dmg and reload speed
Primed Expel: Double dips heat status DoT (swap depending on faction). If you dont like this you can use [Hornet Strike] or [Galvanized Shot]
Viral 60s: gives status chance and viral status which multiplies all damage to health by 4.25x at 10 stacks
[Scorch] + [Primed Heated Charge]: increases status further, increases heat weighting, increases heat DoTs and increases raw damage
Cascadia Flare: provides base damage. Merciless is viable alternative.

Riven
MS, FR, Heat -negative , replaces [Anemic Agility] slot.

Crit Variant
Run Secondary Enervate and run [Primed Target Cracker] over [Scorch]. Use Paladin Virtue ideally to boost base crit damage.