Vanguard reputation upgrade I believe is where mine came from. I went through a period where I was powerleveling (save up a ton of 5k bounties), right after nightfall + weekly completion, so every week I'd get 2 vanguard levels. I received a fearsome set of drops. Badger w/ Firefly and Outlaw, the B-Line. A NiTC with Outlaw and Firefly as well. B-Line has the highest firerate and ammo reserve, which is why its my favorite.