This allows you to dial back to your exact zero even after field adjustments. Lose the manual, and you might strip that tiny set screw using the wrong tool (often a 1.5mm or 2mm hex key, as noted in the manual).
If you have lost the manual, here are the critical specs you are missing. Do not deviate from these when mounting or cleaning. bushnell 3-9x40eg manual
Bushnell 3-9x40EG is a versatile, illuminated riflescope designed for precision in diverse lighting conditions. It is particularly popular for air rifles, crossbows, and general hunting due to its adjustable magnification and dual-color illumination. Anissh Armoury Core Specifications Magnification : Variable 3x to 9x zoom for close to long-range targeting. Objective Lens This allows you to dial back to your
: Look through the scope at a plain wall or the sky. Turn the fast-focus eyepiece until the reticle (crosshairs) appears sharp and crisp to your eye. Magnification Change Do not deviate from these when mounting or cleaning