Originally Posted by Actionmonkey
Majority of holsters allowing a light will have room to get to the trigger because of the light. I carry a G17 with a Blackhawk level 3 light bearing and I can get to the trigger but it is rather difficult and uncomfortable. It's just because of the light design being wider than the handgun.
The light is wider than the trigger guard, so the holster needs to be wider than the light. That necessarily creates a gap between the trigger guard and the holster. I have never used a WML holster where you could NOT get something like a finger or pen in there to the trigger, but alas I have never tried to pull the trigger in that situation.