Question about the acquisition of some PVE guns

Long story short, i came back the previous month after a very long hiatus and i missed a lot of content so i'm kind of trying to catch up in PVE stuff in particular.

What is most effecient way to get these gun?

-Raging bull buster (it's temporary in grim reaper box, is there a perm version of it?)

- Righteous Shotugun (is there another way other than conquerer points from Void/Frozen maps) ?


-AK buster, Seriously where is this gun?

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