Let's be real, you are doing yourself a BAD thing to select the six-shooter perk as it currently stands. I have seen many people run Way of the Outlaw without selecting the perk node on purpose. It's been proven that the bottom tree can do more damage with its three precision bullets. Your super is so short you can barely even shoot all six shots before it runs out. What's the point? It obviously needs some tuning.
Bungie was most likely going for a more crowd control build with Way of the Outlaw, so here is my proposed change: "Six-Shooter - Golden Gun can be fired rapidly up to six times, and causes killed targets to explode, all at the cost of decreased shot damage."
Combined with Deadshot, an Outlaw Gunslinger would excel at wiping squishy adds from the battlefield. The best part is that the thing would still work in PvP. As it stands, there is no point in running the six-shooter in PvP. The duration is simply too short, along with the fact that there are only four enemies in PvP to kill. While the Golden Gun would now be a two shot kill in PvP, at least you aren't completely hindering yourself.