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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Legend campaign on all 3 characters followed by season pass upgrade material is the only way now I Think. I got most of them from the campaign and topped up with the material that lets you make it a red border.