The Crucible Gunsmith on The Farm is not offering the Faction Reward after gaining enough reputation in the faction, stagnating all progress in that faction. The little animation that accompanies the reward engram is present but there is no reward. After disconnecting and reconnecting multiple times there is still no change.
-
You need to be level 20 and finish the red war campaign then you can collect you reward from Banshee at the tower.