Holosun HS503R Micro Red Dot Sight – Multi-Reticle System | Rotary Dial

Important Note
This optic is designed for rifle and carbine platforms with compatible mounting rails. The HS503R includes both a low-profile mount and a lower 1/3 co-witness mount for flexible installation.

Overview

The Holosun HS503R Micro Red Dot Sight is a versatile optic designed for rifles and carbines, featuring Holosun’s Multi-Reticle System (MRS) and an easy-to-use rotary brightness dial. The optic allows shooters to switch between a 2 MOA dot, 65 MOA circle, or circle-dot combination, providing flexibility for both precision shooting and rapid target acquisition.

Built with a durable aluminum housing and powered by Holosun’s Super LED technology, the HS503R delivers long battery life and reliable performance across a wide range of shooting environments.

Key Features

• Multi-Reticle System (MRS) – Choose between 2 MOA dot, 65 MOA circle, or circle-dot reticle.

• Rotary Brightness Dial – Simple and intuitive dial control for brightness adjustment.

• Holosun Super LED Technology – Up to 50,000 hours of battery life on a single CR2032 battery.

• 12 Brightness Settings – Includes 10 daylight settings and 2 night vision compatible settings.

• Dual Mounting Options – Includes lower 1/3 co-witness mount (1.63") and low-profile mount (.75").

• Durable Aluminum Housing – Built to withstand recoil and harsh field conditions.

• Multi-Coated Optics – Enhances light transmission and reduces glare.

Product Description

The Holosun HS503R Micro Red Dot Sight provides shooters with a durable and highly adaptable optic for rifles and carbines. The Multi-Reticle System allows users to select between a precise 2 MOA dot for accuracy or a larger circle reticle for rapid target acquisition, making the optic suitable for both range and defensive shooting.

A rotary brightness dial provides quick adjustment of illumination levels, allowing shooters to adapt to different lighting environments without navigating push-button controls. The optic includes 12 brightness settings, including night vision compatibility.

Constructed from rugged aluminum and finished with Holosun’s Micro Arc Oxidation surface treatment, the HS503R is designed to withstand recoil and environmental exposure while maintaining consistent performance.

Included in the Box

• Lower 1/3 Co-Witness Mount (1.63")
• Low Profile Mount (.75")
• T10 L Key
• Rubber Lens Cover
• CR2032 Battery
• User Manual
• Lens Cloth

Optical Specifications

• Reticle: 2 MOA Dot / 65 MOA Circle / Circle-Dot
• Reticle Color: Red
• Light Wavelength: 650nm
• Magnification: 1x
• Eye Relief: Unlimited
• Parallax: Parallax-free
• Lens Coating: Multi-coated

Electronic Specifications

• Battery Type: CR2032
• Battery Life: Up to 50,000 hours
• Brightness Settings: 10 daylight / 2 night vision

Physical Specifications

• Window Size: 20mm diameter
• Dimensions: 2.75 × 1.43 × 1.62 in
• Weight: 3.53 oz

Mechanical Specifications

• Housing Material: Durable Aluminum
• Surface Finish: MAO (Micro Arc Oxidation)
• Adjustment Per Click: 0.5 MOA
• Windage & Elevation Range: ±50 MOA

Environmental Specifications

• Water Resistance: IP67
• Vibration Resistance: 1000G
• Operating Temperature: -30°C to 60°C
• Storage Temperature: -40°C to 70°C

Specifications Summary

• Brand: Holosun
• Model: HS503R
• Article Number: HS503R
• UPC: 605930625301
• Product Type: Micro Red Dot Sight
• Reticle System: Multi-Reticle (2 MOA Dot / 65 MOA Circle)
• Battery: CR2032
• Battery Life: Up to 50,000 hours
• Mount Options: Low Mount & Lower 1/3 Co-Witness