The Arisaka Momentary Tailcap is a top-tier replacement switch tailored for use with the Arisaka 300 and 600 Series Light Bodies, as well as Surefire Scout lights. This specific model is engineered for momentary operation, providing a twist feature for a constant on setting. For constant light, simply thread the tailcap all the way in. To avoid accidental activation during storage or travel, back out the tailcap roughly two turns. Momentary switches are highly favored by many weapon instructors, as they streamline light operation. Under stress, there’s no risk of inadvertently triggering the light by pressing too hard, which is a common issue with other models like the Surefire Z68 or Arisaka Clicky Tailcap. Setting up the Arisaka Momentary Tailcap is straightforward: 1. Attach the tailcap to the light body until the light activates. 2. Back it off between 0.5 to 1.5 turns to achieve your desired switch travel and feel. 3. The light will stay on as long as the button is held down. Constructed from CNC machined 6061-T6 aluminum and finished with a MIL-A-8625 Type III hard coat anodization, the Arisaka Tailcap promises exceptional durability and reliability. This high-quality piece is manufactured in specialized factories, ensuring precision and superior performance. Enhance your lighting setup with the Arisaka Momentary Tailcap, designed to offer simplicity and effectiveness in high-pressure situations.