I think you get the pieces by capturing one lvl4 hyena, outcast and true sons control point.
1 component per control point captured.
At least thats how it was back then. Then you had to obtain something overnight from black tusk at a specific location but not sure if you still have to do that after re-crafting the item
Jefferson Trade Centre today has holster as targeted loot.
First drop was the gunslinger holster, i was so hyped up about the imperial dynasty, i even forgot there's another holster in the pool... needless to say my happiness didn't last very long. Then i instantly remembered there was a thread about it here...
I suggest give it a few tries, you might get lucky.