The Light Control System (LCS) is very versatile. As such, there are a lot of possible configurations. This LCSmk1 mount is designed for the Surefire ST07 Remote Tape Switch for Weapon lights. The same tape switch that is often supplied with the Surefire Scout series. The ST07 Tape Switch fits: SureFire Weapon Lights with plug sockets, including Millennium Universal, Classic Universal, Scout Light fitted with socketed tailcap, X300 and X400 with XT tailcap assembly. When properly fitted with the SureFire socketed tail cap, this product is also compatible with the Arisaka Defense Scout Series lights. Unique Patent-Pending design utilizes a slot that ensures a snug, perfect friction-fit for the tape switch. Once installed its not coming out unless you want it to. Custom-manufactured size 8-32 Torx-drive screws are made from hardened steel and then black nitride plated for superior corrosion resistance.