I have a Surefire G2 which I've used occasionally when I saw hogs after dark.  Once with the rifle, and a couple of times with the pistol.  I don't have it mounted to either, but it's small and easy to hold.  You don't get a lot of range with a tactical, they are designed for more up close and personal type of confrontations, but they are plenty bright.  My Surefire is noticably brighter than a 2D maglight, but doesn't quite have the distance.  If I were you, I'd get one because they are really handy to have and if you get in a situation when you need some light, they are more than adequate, just don't think you're getting a spotlight in your pocket, they're not made like that.