The SureFire Z41 tailcap has been around for quite a while. For more than 25 years this classic design has remained largely unchanged, even as handheld lighting has evolved immensely. Inside its aluminum or Nitrolon shell, the Z41 houses a ruggedly simple switch mechanism that has proven itself to be durable, reliable, and ideally suited for tactical use. With a simple user interface that allows momentary operation with a press of the tailcap, the Z41 ensures the flashlight is easy to activate when needed and, equally important, turns off when the switch is released. Constant operation is achieved by simply twisting (tightening) the tailcap.
Although the Z41, along with its many derivatives, works well for its intended purpose, it’s not perfect for every application. Some would prefer the convenience of a click-type tail switch while others may wish for a lower-profile or more efficient alternative. Whatever the case, the popularity of SureFire flashlights has led to the creation of several aftermarket solutions allowing the Z41 switch mechanism to be replaced using only simple hand tools.