I've been farming heroic bounties for hours and I am never rewarded with a red border weapon. If bungie didn't want us to craft these weapons, why in the hell are they so hard to aquire? I've tried all farming methods, none of them are dropping red border weapons.
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The strand machine gun and the SMG - both non craftable - are pretty good. I would like to get the heavy wave frame launcher though. And also can't get red borders. Anyway. Who cares.