BRIEF OPINION OF BUILD
For this build, we'll use the synergy of the CORROSIVE PROJECTION [Mesa] Aura mod to remove all enemy armor and apply Heat damage to burn them, in addition to applying the ARCANE HOT SHOT bonus for critical chance.
In short, the GALVANIZED DIFFUSION mod grants you 110% base multishot and, on kills, an additional 30% multishot for 20 seconds, stacking up to 4 times for a total of 230%. (which increases the number of shells per shot and the damage much more)
LETHAL TOWER: Further increases multishot by 60% and also fire rate by 60%, which is much more beneficial for firing the [Regulators Prime] 🔥
PRIMED TARGET CRACKER : Grants you 6.3x base critical damage. (So every shot hits harder)💯
PRIMED PISTOL GAMBIT : we will use it for the 187% Critical Chance, this helps us push the red criticals more.
PRIMED CONVULSION + PATHOGEN ROUNDS : For 165% Electric and 90% Toxin raw damage, this will grant Corrosive to increase armor damage. Raw damage is preferable to 60/60 mods here, as too many status effects aren't very beneficial on [Regulators Prime].
PRIMED HEATED CHARGE: This grants Heat damage, which, in addition to dealing all the raw damage, will also cause red critical hits.
GALVANIZED SHOT: Grants +80% Status Chance and on kill: +40% direct damage for each type of status effect applied to the target for 14 seconds. Stacks up to 3 times (this gives you a total of 120% direct damage for each status effect already applied, which is why I put it almost last). ☠️
The SECONDARY FORTIFIER Arcana grants 1 Overprotection for every 100 damage dealt to an enemy's Overprotection. Deals x8 additional damage to Overprotection.
Having explained all of this, I want to clarify that this build works against all enemies, but it excels especially against Orokin, Grineer, and Acolytes—in other words, any armored enemy.
Furthermore, thanks to [Mesa]'s build, we'll gain extra Viral damage, giving us three types of elemental damage: 🦠Viral +🔥Heat +
Corrosive.
Archon Crystals to Increase Critical Chance
5x 🟠 Increases Secondary Critical Chance by 1.5% each time you kill with 🔥Heat

BUILD MESA PRIME -> Spanish Photo Mods -> Translate into English
Here's a summary of the MESA PRIME build

I HOPE IT HELPS, GOOD LUCK 👋