I'll keep it short:
I've been going after the Wayfarer Title which requires all BrayTech weapons to be found from BrayTech Engrams. These are supposedly [u]rare[/u] drops from Sleeper Nodes. I've opened at least 100+ Sleeper Nodes this week and have only found [b]one[/b] Engram which gave me a [b]duplicate[/b] weapon.
Bungie it shouldn't take this long to get these types of weapons, especially since 1) Forsaken has brought so many good weapons that everyone's using and 2) I've played Warmind since the day it was released and it shouldn't be this hard.
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If you haven't completed the Nascent Dawn 1/5 quest step on all characters, do so. It rewards a warmind engram with those weapons in it. Might be duplicates, but it's still more chances.