Endgame build for the [Sporelacer] kit gun. Yes, I know this thing uses 7 forma, but it’s worth it. Obviously there are other secondaries that are just as or even more powerful but it’s still great to use, fun and reliable. Anyway, here’s the specifics:

Exilus- Lethal momentum is arguably the only good one but you can put whatever

Galvanized Diffusion- essential for nearly every pistol build

[Pathogen Rounds], [Convulsion] and [Heated Charge] are there because I like corrosive and heat damage for armoured enemies, but you can swap it with other elements as you like(you may need to change the polarities) Against corpus simply swap Pathogen Rounds and Heated Charge

Lethal torrent- adds a nice chunk of dps

(Prime)Pistol Gambit -mandatory crit (if you’re gonna use pistol cannonade replace this with creeping bullseye. Need to change polarity tho)

(Primed) Target cracker- another must have mod(not flexible)

Hornet Strike- this can be replaced with Semi Pistol Canonade if you don’t need extra fire rate

[Primed versions of the mods aren’t too important but they do make a difference especially when maxed

Arcanes: Secondary Merciless is probably the best secondary arcane for this, but cascadia flare is slightly better at max stacks but harder to maintain. Pax Charge basically give infinite recharging ammo for the gun and the other kit gun arcane are not worth using.

Other secondary arcanes to consider using:
Secondary Fortifier - Eximus killer
Cascaia Overcharge - Funny Crit numbers