I also used trust and sometimes malfeasance to earn my Luna. Trust with explosive rounds is such a good counter to Luna. Malfeasance because it's so stable and also has a form of explosive rounds.
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I don't even have the explosives rounds variant. I do have rampage on mine though, so one kill is all I needed to start off a chain reaction. I also run extended mag on it too so I can get maximum output for my rounds.