Actually, where i have my forward grip, using it as a hand stop, my thumb lays on top of the switch pad.
I'll try and monkey a pic of that for you. Don't anyone throw me a football...:lol:
It measures 1" from center of button to left edge of rail, closest to light.
http://pic20.picturetrail.com/VOL132.../411020747.jpg
http://pic20.picturetrail.com/VOL132.../411020746.jpg
http://pic20.picturetrail.com/VOL132.../411020745.jpg
http://pic20.picturetrail.com/VOL132.../411020744.jpg

