On my Oldwing I just put in the ripoff left hand fairing pocket, seems to be made for it. I still have to experiment with the newer to me Road King, but I'm thinking the leather Velcro pocket in front of the left saddlebag.
It needs to be left side though, never know if ya gonna need it while running.
This of course brings the onus of accuracy on you, best to practice left hand shooting.