Holosun HS403B Micro Red Dot Sight – 2 MOA | Shake Awake | 50K Hour Battery

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

Overview

The Holosun HS403B Micro Red Dot Sight is a compact and durable optic designed for rifles and carbines. Featuring a 2 MOA precision red dot, Holosun’s Super LED technology, and up to 50,000 hours of battery life, this optic delivers fast target acquisition and long-lasting performance.

With Shake Awake technology, digital brightness controls, and a rugged 6061-T6 aluminum housing, the HS403B provides reliable performance for range shooting, training, and defensive applications.

Key Features

• 2 MOA Precision Red Dot – Crisp aiming point for fast target acquisition and improved accuracy.

• Holosun Super LED Technology – Provides up to 50,000 hours of battery life.

• Shake Awake Technology – Automatically activates the optic when movement is detected, conserving battery life.

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

• Side-Mounted Battery Tray – Allows easy CR2032 battery replacement without removing the optic.

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

• Durable Aluminum Construction – Built with 6061-T6 aluminum housing for strength and recoil resistance.

• Digital Brightness Controls – Push-button controls for quick brightness adjustments.

Product Description

The Holosun HS403B Micro Red Dot Sight is designed to provide reliable aiming performance in a lightweight and compact optic. Its 2 MOA red dot reticle offers precise targeting while maintaining quick target acquisition for fast shooting scenarios.

Holosun’s Super LED technology allows the optic to operate for up to 50,000 hours on a single CR2032 battery, while Shake Awake technology automatically powers the sight on when motion is detected. This combination helps extend battery life and ensures the optic is ready when needed.

Constructed from 6061-T6 aluminum with a hard-anodized finish, the HS403B is designed to withstand recoil and environmental conditions. With included mounting options for both low-profile and lower 1/3 co-witness setups, this micro red dot sight is suitable for a wide range of rifle and carbine platforms.

Included in the Box

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

Physical Specifications

• Window Size: 20mm Diameter
• Dimensions: 2.45 × 1.43 × 1.6 in
• Weight: 2.82 oz

Mechanical Specifications

• Housing Material: 6061-T6 Aluminum
• Surface Finish: MAO (Micro Arc Oxidation)
• Adjustment per Click: 0.5 MOA
• Windage & Elevation Range: ±50 MOA

Environmental Specifications

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

Specifications Summary

• Brand: Holosun
• Model: HS403B
• Product Type: Micro Red Dot Sight
• Reticle: 2 MOA Red Dot
• Battery Type: CR2032
• Battery Life: Up to 50,000 hours
• Brightness Settings: 12 (10 daylight + 2 night vision)
• Mount Type: Low Mount + Lower 1/3 Co-Witness