Yea... i was shocked when I went on wiki and all the part says "C" ... i kept getting lense... the fact that people think this game is tedious is literally due to this, endless farming, I'd understand an assassination mission drop chance be lower but in a rotation C drop? Why??
Mastery Rank is already a pain to rank up, gathering all the gear... and now DE is making all these weapons so hard to farm is even worse....