AIM-O's Advanced 551 red/green dot sight is a compact, rugged optic designed for fast target acquisition on standard Picatinny/Weaver rails. Built from durable metal and hard plastic, it combines a rear-facing keypad with versatile reticle options for reliable performance in the field.

• Color: Black
• Construction: Durable metal and hard plastic housing for reliable use under demanding conditions
• Reticle options: Red or green crosshair reticle, selectable via the rear keypad
• Brightness control: Adjustable reticle brightness to suit varying lighting environments
• Adjustment: Fully adjustable windage and elevation for precise zeroing
• Battery system: Stores 4x AG13/LR44 batteries in an accessible, lever-locked compartment for quick changes (batteries not included)
• Mounting: 21 mm screw-on mount compatible with standard Picatinny/Weaver rails
• Weight: Approximately 210 g
• Operation: Rear-facing keypad provides on/off control along with color and brightness adjustments

This sight delivers a straightforward setup and dependable performance, helping you acquire targets faster with either red or green illumination. The combination of a compact profile, adjustable reticle, and easy-access battery compartment minimizes downtime, making it a practical choice for tactical drills, competitive shooting, or recreational use on rifles and pistols alike.