I'm not going to lie this thing is kind of retarded. Its very large and bulky and tries so hard to be "tactical". It works I guess, but filters out a lot of the light so you end up with very little red light left over which is alright for some applications where you would want less. The flip cover works great until you actually put it on the light when it becomes impossible to flip off with one hand; this may just be a flaw in the one I have though. I also can't figure out why they half silvered it which doesn't seem to have any purpose. Overall this is a big, ugly and expensive tacticool piece of plastic to make your surefire produce red light. I have also heard of cases of these things snapping the first time they were installed on the light, but mine has held up thus far.