How to increase chances of luneshine weapons from the Grinder?

Borderlands: The Pre-Sequel BL: TPS Loot and Weapons Chat
#1

I’m going for the “Greater Than the Sum of Its Parts” badass challenge. Does anyone have any tips on getting luneshine weapons more often???

Thanks!

GT: BonafideTen7
Xbox 360

#2

it’s just luck.

#3

yeah, don’t waste your time with that challenge. takes way too long for the low chance of getting luneshine.

#4

I was only 2 or 3 Luneshine weapons away from the achievement accidentally deleted my @#$% Level 55 Lawbringer. Ugh! I’d been farming Moonstones like crazy in Serenity’s Waste.