Note: The number of Forma needed to build this is deceptive. You'll want to put 5 on it, but you don't need have every slot have a polarity.

This build is really about hitting heavy and hitting fast. Because the weapon has a base accuracy of 100 you can fit [Heavy Caliber] without suffering to heavily at accuracy loss.

[Vigilante Supplies] should actually be [Sniper Ammo Mutation]. I do suggest if you're using [Carrier] with [Ammo Case] to replace the Mutation mod with [Terminal Velocity] giving you better long range accuracy.

Obviously High Voltage and Malignant Force should be replaced with other Element/Status mods depending on faction. If you're using this weapon for Eidolon fighting I highly recommend [Stormbringer] and [Hellfire] to maximize damage.