I read this and just wanted to share with those that haven't seen it yet. I thought it was pretty informative.
Rail Guns For Home Defense
from Guns & Ammo
"...The main advantage to a gun-mounted light is that it frees your nonfiring hand to open doors, turn on lights, hold onto handrails and other such tasks..."
I did think it was a bit scary how the author is practically sticking his hand in front of the muzzle to grab the door handle tho...
Made me think about the scenario at least. That's why we gotta practice before we need to do it!