I had an M3 for a couple years on a G17 that was a dedicated nightstand gun. Unfortunately I had to include the light with the 17 on a trade for another Glock and some stuff. I really miss the thing and will be getting another as soon as budget allows. I never had any problems and it was as bright as I would ever need it to be.
Who has a Glock with a light / laser on it ?
I would like some input on the people who have a Glock with a light or light/laser combo attached on the rail. I was looking into getting the X200 on a G23 or G19 ( or maybe the G21 ) ? I have heard some negative stuff about the Glock frame when a light is attached to it. Any input or opinions are welcomed, thanks guys. 
