This is a replacement assembly for the rear cap or tailcap of the SureFire M6XX Scout Light series in black color. It is designed for use with a SureFire tape switch but does not include the ST07 tape switch. By replacing your Scout Light's original rear push-button cap assembly with this cap, you can attach a SureFire tape switch for increased versatility. The cap has a lock-out feature that prevents activation during tactical operations, transportation, or storage. It is made from aerospace aluminum, Mil-Spec Type III hard-anodized, and is available in Black or Desert Tan. This upgrade is a valuable addition to your Scout Light.