I was helping a friend yesterday in the GBR and found out that Nidra along with the new Twins drop on S ranked Fantastic Voyage.

Nidra gives +10% damage on techs and its great for techers, specially with the LB expansion right around the corner. Of course it would be great getting the grenade launcher that is worth tons, but if the primary goal is to work on techers, you need only run S rank of that mission.

Obtain enough Nidras and grind them to 10/10 before grind boost wears off. They sell decently too.