Hello to any that can assist
I finally finished The Bank Job quest and talked to Banshee. He had the catalyst but as soon as I obtained it and tried to equipped it, the catalyst said "Complete objective to unlock". I backed out and rebooted. Now the mission is gone, Banshee thinks I did the quest and the Catalyst wont unlock.
PLEASE HELP!
Issue has been resolved, PEBKAC....
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So when you inspect the gun, the catalyst box will be empty but if you hover over it, it will show you it. You now need to get kills with the gun to unlock the catalyst. Quest earns you the catalyst, kills unlock it for equipping.