Home defense shotgun and hope will never have to use it. With that said, I will occasionally train with it at the range with the light on it.

I use a P2X Fury. It's not designed as a weapons light per se, but a 1" scope ring with integral Weaver style base holds it securely on the lower rail of my Hi-Point Carbine. It is positioned so that I only have to extend my index finger to activate the on/off switch.

http://www.cotep.org/forum/picture.p...&pictureid=762

http://www.cotep.org/forum/picture.p...pictureid=1046