Finally got this after it evaded me in TTK.
It dropped with Headseeker. Hand-laid stock (gives max stability), full auto.
I'm pretty happy with this but not on the up and up with what's a good roll or not.
Edit. Ok I meant y1.
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I never had one when it was a true beast during house of wolves. I understand why bungie changed the weapon but I think about those players that grinded the strikes, some going as far as 500 plus just to have a shot at it. I did have an echo 33 for a week or 2 before they changed the archetype and the taken king was released. Echo was the rare version of hopscotch. You could 2 burst people all day as long as you could hit your criticals.