http://usagunblog.com/?p=198 The weight of them is what really surprised me. This will not pull the end of your gun down like the other modules would. Cant wait to touch one, that is for sure! They have a picture on their website crimsontrace.com of a glock with the laser module and the lightguard installed. Does adding a light increase your chance in a tactical situation or actually hurt you? I hear a lot of talk about adding or not adding a laser/light to a handgun. I prefer to have the laser/light because when used properly my chances seem to be better.