The HS403B, by Holosun, is a 20mm micro-optical sight red dot designed for rifle and carbine applications. Therefore, features include 12 brightness settings, Holosun’s Super LED with up to 100k hours battery life, and 2 MOA Dot.

The HS403B is a small compact micro red dot optic. For instance, employing Holosun’s LED technology, the lifetime for one CR2032 battery can be up to 5 years. This optic features our “Shake Awake” technology that powers the optic on with the slight movement of the 403B. It may be installed on various firearms such as shotguns, pistols, air rifles, and crossbows. The HS403B is compatible with standard mounts.

Tech & Features:

          • 2 MOA Dot Reticle
          • Up to 50,000 Hours of Battery Life (Setting 6)
          • 12 Brightness Setting: 10 DL & 2 NV Compatible
          • Convenient Tray Battery Compartment
          • Parallax-free & Unlimited Eye Relief

Special Price Now $242.99 + FREE SHIPPING

Canceled Orders – Any order canceled for any reason will be charged a 2.9% cancelation fee. Be sure of your Red Dot model before you buy it or consult with one of our technicians.

Red Dot HS403B

Kit Content

    •  Lower 1/3 Co-witness Mount
    •  Low Profile Mount
    • T10 L Key
    •  Rubber Cover
    •  Download User Manual
    •  CR2032 Battery
    •  Lens Cloth



        • Reticle2 MOA Dot
        • Light Wavelength650nm
        • Reticle Color Red
        • Parallax Free Yes
        • Unlimited Eye Relief Yes
        • Magnification1x
        • Multi-Coatings Yes


        • Power Source Battery
        • Battery TypeCR2032
        • Battery Life (Hours)50000
        • Brightness Setting10 DL&2 NV


        • Housing Material6061 T6 Aluminum
        • Surface FinishMAO
        • Adjustment per Click0.5 MOA
        • W&E Travel Range±50 MOA


        • Window Size20mm Diameter
        • Dimension (in)2.45×1.43×1.6
        • Weight (oz)2.82


        • Storage Temperature-40℃~70℃
        • Working Temperature-30℃~60℃
        • SubmersionIP67
        • Vibration1000G

HOLOSUN® Limited Lifetime Warranty

Your Holosun product is warranted to be free of defects in materials and workmanship with the Holosun Limited Lifetime Warranty. Therefore, this warranty applies to the first owner upon registration of the product.  In addition, this warranty specifically applies to the metal structure of the product housing and does not apply to the optical and illumination systems.

The optical glass has a 5-year warranty. For instance, the illumination system including electronics and LED has a 3-year warranty. Secondly, batteries don’t have coverage under warranty. Therefore, in the event of a confirmed defect under this warranty, Holosun will, at their option, repair or replace the product with a Holosun product of similar type/function, and of equal or greater value. Finally, Holosun reserves the right to make substitutions for similar product/s if the warrantied model in question is no longer in production.

This Limited Lifetime Warranty does not apply

    • Asserted defects caused by normal wear and tear of any part. For instance, that including knobs, finish accidents, neglect, misuse, abuse, etc. addition.
    • Asserted defects caused by modification including; aftermarket finishes, unauthorized service, improper maintenance, and acts of Nature.
    • Asserted defects involving subjective personal likes or judgments.

Therefore, this warranty is null and void if modification or maintenance is provided by someone other than Holosun. For instance, Holosun may restrict warranty service for our products to the country from which Holosun or its authorized dealers originally sold the Holosun product.

Therefore, the purchaser has full responsibility for warranty claims outside the United States, the costs of shipping or transporting the product (including to and from Holosun or our dealer), any insurance, or any fees, duties, and taxes.

Additional Warranty Information:

We are aware of NON-AUTHORIZED parties selling COUNTERFEIT Holosun Technologies Inc. products on Amazon. Therefore, regarding this issue, we are alerting our valued customers, retailers, and distributors that Holosun Technologies Inc. is actively working to resolve it. For instance, please note that Holosun Technologies Inc. will NOT honor its Limited Lifetime or Elite Warranty for any products sold on Amazon by Non-Authorized Resellers. Therefore, we recommend that you use caution in buying products from Non-Authorized Resellers as they may not perform as intended.