This quest is glitched. I've played the Salt Mine numerous times, tuned weapon selected at Kay and still stuck at Step One since the 'Activity completed and attuned weapon acquired' never checks out.
How has this glitch not been fixed?
-
Did you go through the Call To Arms launcher or the regular Solo Ops one? You gotta go through the CTA launcher otherwise it doesn't count because ... reasons. I made that mistake with Heliostat.