I have an SBR with a 10.5" barrel and NSR hand guard and want to mount a weapon light up front. I typically I run my front grip with my thumb over the top of the rail and I wondered if there is a "best" way to mount a light so it can be thumb actuated from that position? I'm planning on going with a Surefire or Streamlight style light that has the toggling lever switch on the rear of the light.