Hi!

The [Ambassador] is a good weapon with a few drawbacks, being their low ability to eliminate multiple enemies with ease, and of course his shitty ass farm, it will cost ur life but it's a pretty decent gun.

If ur interested in this weapon be aware that the hardest part to get of the set is the main BP.

Things to consider in this build:

Why corrosive instead of viral?
I consider that corrosive damage is better when dealing with Steel Path enemies since u want to reduce their resistances to make good damage, since this guns lacks that punch required to make some serious damage on foes i believe corrosive is better.

Rivens?
Try looking for something with these +stats in prio order:
CD/MS/TOX/DMG/CC/FR
And for negatives:
Zoom/Recoil.

When replacing the riven, i recommend gettin rid of [Hammer Shot], be aware that u will need to add one more forma IN CASE U USE THE EXILUS MOD

Why that Exilus Mod?
The [Ambassador] Spits bullets so easily, this will help ur ammo economy, but if u don't care, go for [Vigilante Supplies] to get a little bit of more DMG or straight up don't use an exilus mod to save one forma.

Galvanized Mods?
If ur a fan of Galvanized Scope u can include it in the build by replacing [Hammer Shot], if u do so, replace Primary Merciless for Primary Deadhead, this way ur going to stack the same damage of mercilles in an easier way and for longer time.

Finally, as a side note, if you want mor Status Chance, replace [Infected Clip] for [Malignant Force].