I don´t have the game in english so I don´t know if that is the name of the adventure. (In spanish the adventure´s name is "Maestro de Armas"). After killing 6 guardians in 4 crucible battles with each of the main weapon categories (automatic rifle, pulse rifle, explorer rifle and hand cannon). I have to speak with Banshee 44 at the tower. But at the time I reach him I´m not able to complete the quest. I´ve read that the quest is disabled cause It was impossible to complete the part of the 6 kills with automatic rifles, but I´ve completed the entire adventure the past week.