If you don't have a riven replace it with Galvanizde Aptitude and on your 4th forma instead of Madurai use Vazarin.

This was an ideal roll for those who are planning to get one. Negative Zoom is okay but since the weapon doesn't have a maximum ammo per se hence -Ammo Maximum is a blessing for this weapon.

For the exilus slot you have two options:
1. Vigilante Supplies - You only need the plus 5% chance PASSIVE BONUS to increase critical hits from Primary Weapons.
Leave the polarity as is (~ or Naramon) so you would only spend 4 Forma.
2. Terminal Velocity - This is user preference, though even if I find it quite good I would still personally stay with [Vigilante Supplies].
There is no noticeable arrow drop off though it is not as fast with [Terminal Velocity] equipped.
Additionally if you are planning on using [Terminal Velocity], you have to invest another forma to change it to (v or Maduari)

If you are not a fan of Faction Mods, you could change the [Primed Bane Of Grineer] to mod of you choice.
Good thing it is a Madurai mod slot, there would be a lot of options to slect.

You could either go:
[Hunter Munitions]
[Galvanized Scope] (change also Primary Merciless to Primary Deadhead for this option)