This is specifically for use WITH a flat crit boost such as Harrow and Arcane Avenger, which can boost crit chance from 10% to 105% (Harrow + avenger body shot) or 245% (harrow + avenger headshot).

Currently, Galvanized Aptitude is multiplicative with Serration and Primary Merciless/Deadhead.

If you are NOT using Harrow or Avenger
Replace Hunter Munitions with Hellfire, Vital Sense with Serration and Rime Rounds with Primed Cryo Rounds.

For Corpus
Replace Rime Rounds and Hunter Munitions with Infected Clip and Serration.