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The black Z68 Protective Rear Cap Assembly from SureFire is a pushbutton switch for select flashlights including those in the E-Series flashlights and Scout weaponlights. The two-stage switch provides the lights with momentary and constant-on activation options. This cap features a raised lip around the pushbutton and a lock-out feature that helps to prevent accidental activation of your SureFire flashlight in storage, the field or in a pocket. The assembly is made from the same CNC machined aluminum and black Mil-Spec anodized finish to match the look and feel of the light it is put on.