Let me go down week by week, mmkay? DL:DR - Sunbreakers: 4x in 9 weeks, not since then /\ Voidfang Vestments: 7 times in 10 weeks, not since then /\ Starfire Protocol: 4 times in 3 weeks, all in the last 4 weeks. Proof that Xur is NOT RNG, and that we can expect Half Life 3 any day now. 1 - Sunbreakers 2 - Sunbreakers 3 - Apotheosis Veil 4 - Sunbreakers 5 - Voidvang Vestments 6 - Light Beyond Nemesis 7 - Voidfang Vestments 8 - Voidfang Vestments 9 - Sunbreakers 10 - Voidfang Vestments 11 - Voidfang Vestments 12 - Voidfang Vestments 13 - Light Beyond Nemesis 14 - Voidfang Vestments 15 - Claws of Ahamkara (wow something new!) 15 - Claws of Ahamkara (lol, jk) 17 - Starfire Protocol 18 - Starfire Protocol 19 - Obsidian mind (bricks were shyted) 20 - Starfire Protocol Edit: Yes, Xur could be on a weighted system or a two roll system to determine which item he sells. I do not think so as his inventory is exactly the same as week 17. If Xur is RNG, then it is a really bad RNG. Edit 2: The only other thing I can think of is that BUNGiE tracks which Exotics are in use and sells ones from a list that is compiled of all Exotics that are below a certain % of use in the playerbase.