Easier ways to get dupes

Rares are easy to come by but duplicates of the weapon you want can take from days, to weeks, to even months of waiting so here are different ideas for getting dupes.
1. Training Captains
Each captain buffs a items so when you reach a tier evolution level you should be able to choose which one of the items the captain buffs for yourself (it will be a rare T2-4 and an epic at T5)
2.
Combining dupes of lower rarity to create higher rarity items. 5 common duplicates to make an uncommon, 10 uncommon duplicates to make a rare. It stops at rare.
3.
Reaching a new league should grant you a rare item of your choice. Rares from challenger to masters and an epic item for reaching nightmare league
4.
More weapon achievements like doing X amount of damage with this weapon to recieve another one of it. Maybe 100-500k

 

Second point really makes sense. I like that one. It will bring to use all the uncommomn powercells sitting in Junkbox