So this gun is way better than most people think it is. I would say it's a sleeper weapon. I would even go as far to say that thanks to it's Riven disposition this build outclasses anything you can do with the Kuva Hind even with faction mods making it as far as I've found yet, the best full-auto non-AOE gun in the game.

With 3.3 Multishot, and 22.5 firerate, the 25% Status chance is more than enough to get your viral procs in.

I went with Primary Merciless over Deadhead because with how much you'll be reloading with this weapon and it's insane damage output you will benefit much more from the uptime from faster reloads than the added headshot damage.

Put whatever you want in the Exilus slot but you will need to forma more to make it fit. No need for [Hush] since the weapon is already silent, and not really any need for more Accuracy either tbh so I would probably go with [Agile Aim], [Tactical Reload], maybe [Mending Shot], or even though ammo isn't an issue [Vigilante Supplies] for that 5% chance crit boost if you wanted.