This is the build I used throughout soloing Steel Path. A few notes:

• This build is a bit slow to get going. You'll need to build stacks as quickly as possible in order to start achieving maximum output, as well as maintaining buffs to maintain lethality.

• If you don't have a Riven, I strongly recommend Point Strike, as I use my Riven in place of it.

• This particular damage set is specifically intended for my use outside of Steel Path or in Steel Path against Corrupted. Damage combinations for other factions being:
  Grineer - Stormbringer / Malignant Force
  Corpus - Primed Cryo Rounds / High Voltage
  Infested - Hellfire / Malignant Force

• Make use of automatic fire to keep your [Galvanized Scope] up and spread status effects, and use the burstfire for hard targets. If you're keeping the Galvanized mods and Deadhead fully stacked, burstfire should be lethal on just about anything in one or two bursts.

• If you're using this with my Mag Prime build, entire waves of Ensnared enemies can be used to very quickly build up stacks.

• If you use something else for ammo efficiency or don't care about it, the Exilus is wholly interchangeable, though I'd recommend [Stabilizer] if you aren't going to run Mutation.