After playing more with my previous build (125k SDPS), I realized it was still missing, something.
Ammo.
Never had it.
I'd kill two groups of enemies quickly, and then be out.
So Spent another forma on this weapon to get the ammo.

~~ This is a critical chance build still, but I also realized [Argon Scope] isn't as useful in actual missions on this as it is in the simulacrum, where the enemies are in a predictable spawn.
I replaced [Argon Scope] with [Hunter Munitions], which required yet another forma and another trip to Pluto for leveling.

Because of how much this weapon puts out, you will be procing slashing on multiple enemies at the same time. This allows for the enemies to keep taking damage while you run around and try to find ammo. Which shouldn't be that hard now with [Vigilante Supplies]. ~~

I've updated this after the weapon changes, and now am very pleased with the scope buff.
This is imo, amazing