I've heard its from old strikes- as in, Rocs? Or the one before that, since AAO Is vanilla?
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#Destiny
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It's a TDB weapon. So theoretically, yes you could get it from roc strikes.
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I can't comment on how to acquire it now, it was originally a TDB weapon sold at the crucible vendor with the following perks: Aggressive Ballistics / Field Choke / Accurized Ballistics Persistence Field Scout Grenadier