SureFire Z-XBC X300/X400/XH Black Switch AssemblyThe SureFire X300/X400/XH Black Switch Assembly is a replacement or upgrade part designed for SureFire weapon lights, such as the X300, X400, and XH series. This SureFire Z-XBC switch assembly is typically used to control the light output of these weapon lights and may include various modes like constant-on, momentary-on, and strobe. The "Black" designation likely refers to the color of the switch assembly. It's a crucial component for controlling and customizing the performance of your SureFire weapon light. The SureFire Z-XBC is a replacement for the original switch assembly for the X300, X400, XH30 series of WeaponLights. It is available in black or tan. Note: The Z-XBC is not compatible with the XH50G WeaponLight. The factory replacement switch for SureFire X300, X400 and XH30 WeaponLights (Not compatible with the XH50G)Ambidextrous dual momentary and constant-on push/toggle switch activationDurable polymer construction; available in Black or Tan SureFire X300/X400/XH Black Switch Assembly Z-XBC