From what I noticed is that quest exotics seem to be 30 and the pvp weapons you buy with Marks are also, don't know about Vanguard or Shaxx packages. Hope this helps.
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That's interesting. Something else I noticed, I went to the Exotic booth by the Vanguards to get myself Thorn for PvP and I noticed the Sleeper in there required lv. 40 So I guess depending on how you acquire it affects it as well. I still have my original Sleeper.