Surefire can kiss my arse. They have to know that their exposed rubber tail cap on almost all of their lights is stupid. That cap must be protected like it is in the defender (I think) series. I suppose you can buy a forty dollar replacement tailcap for a light you just spend a hundred bucks plus on. I hate my X300 on my M4 partly because the light gets turned on accidentally when I am moving/storing the gun-killed many batteries that way.