I have a BCM carbine with a fixed FSB and a KMR handguard to which I'd like to mount an X300U. I'd like the setup to be ambidextrous as I shoot left-handed and my wife shoots right-handed. I'm thinking of mounting the X300U at 12:00 in front of the FSB, and putting an XT07 on the top rail behind the FSB.
How can I mount the light in front of the FSB? Or, are there any other suggestions for ambidextrous X300U light placement and activation technique on the KMR and fixed FSB I have to work with?