Title say it!
What guns have you not received via RNG?
The ones I haven't received via RNG are Patience and Time and the Suros Regime and Plan C.
Edit: Not received thru RNG means that you bought it from Xûr but haven't got it randomly. THAT'S what I meant guys.
Edit 2: Just got my first non-Xûr Suros Regime.
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Last word - 4th horseman