Bushnell 3-9x40eg Manual »

The Bushnell 3-9x40EG is a versatile, illuminated rifle scope designed for improved accuracy in various lighting conditions, particularly "Dusk & Dawn" scenarios. The "EG" designation typically refers to its red and green illuminated reticle, which provides five levels of brightness for each color to aid in low-light target acquisition.  Technical Specifications  Magnification: 3x to 9x (variable). Objective Lens: 40mm diameter for high light transmission. Tube Diameter: 1 inch (25.4mm or 25mm).

illuminated Mil-dot reticle, often with multiple brightness settings for dusk or dawn use. Construction bushnell 3-9x40eg manual

Procedure from the manual:

Key Features of the Bushnell 3-9x40EG