Before the railjack rework, when the [Spectra Vandal] was up there with the [Braton Vandal] as one of the worst farms in the game, I spent 4 full 6+ hour days running the same two skirmish missions over and over with a team to get all the parts. Now out of sheer spite I've sunk 10 forma and a riven into forcing this thing to do as much damage as it will possibly put out. It may be way easier to get now but my petty [Rage] still burns and I will still be tweaking this build in my spare time.
Faction mod can be swapped out for whatever you're fighting although obviously the slash is the best killer for armor. Pair with a [Mag] bubble for absolute decimation.