Dear bungie, if I'm being stupid let me know, but I had a helmet exotic engram and a heavy weapon one too. I'm 310 and when I decoded the heavy it was 290.
This shouldn't happen.
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You are not guaranteed a 310 or 320.
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U get 310 exotic when your light level hit 311+.. 100%
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At 311+ you get guaranteed 310 exotics.
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Moving to a more appropriate forum. For your answer, please see @JayD9969's response.
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It's not a guaranteed 310
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You are only guaranteed a 310 exotic once you hit 315+ light