The warrior trait “Crack Shot” is not properly applying a cooldown reduction to the Rifle ability “Volley”. The tooltip shows the 20% reduced cooldown (8 seconds, from 10 secs) but when you actually use Volley it remains on the default 10 second cooldown. All of the other Rifle abilities appear to be correctly benefiting from Crack Shot.
Harpoon Gun abilities seem to be affected by the same bug, they are also not benefiting from the reduced cooldown.