--- product_id: 28163104 title: "HS403B / HE403B-GR" brand: "holosun" price: "£188.63" currency: GBP in_stock: true reviews_count: 8 category: "Holosun" url: https://www.desertcart.co.uk/products/28163104-hs403b-he403b-gr store_origin: GB region: United Kingdom --- # 50,000 hr battery life 2 MOA crisp red dot reticle 6061 aluminum rugged housing HS403B / HE403B-GR **Brand:** holosun **Price:** £188.63 **Availability:** ✅ In Stock ## Summary > 🔴 Lock on fast, stay sharp longer — the HS403B is your ultimate micro red dot. ## Quick Answers - **What is this?** HS403B / HE403B-GR by holosun - **How much does it cost?** £188.63 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.co.uk](https://www.desertcart.co.uk/products/28163104-hs403b-he403b-gr) ## Best For - holosun enthusiasts ## Why This Product - Trusted holosun brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Built to Last:** Durable 6061 T6 aluminum housing withstands the toughest environments while maintaining lightweight agility. - • **Instant Activation:** Shake Awake technology powers your optic on the slightest movement—never miss a critical moment. - • **Versatile Mounting:** Includes both 1/3 co-witness and low mounts for seamless integration on any rifle setup. - • **Unmatched Endurance:** Up to 50,000 hours of battery life means your sight stays ready for every mission without fail. - • **Precision at a Glance:** Crisp 2 MOA red dot with 12 intensity settings ensures flawless target acquisition in any light. ## Overview The Holosun HS403B is a cutting-edge 20mm micro red dot sight designed for rifles and carbines, featuring an ultra-efficient 650nm Super LED with up to 50,000 hours battery life, 12 reticle intensity settings, and Shake Awake technology for instant activation. Built with rugged 6061 aluminum housing and versatile mounting options, it delivers precision, durability, and reliability for professionals and enthusiasts alike. ## Description Product description HOLOSUN Since 2013, Holosun has been committed to creating innovative optic and laser/IR technologies for a broad range of shooting and hunting needs. Today, Holosun is at the forefront of developing new features including innovations such as - up to a 100,000 hr battery life, Solar Fail-Safe technology, Our signature multi-reticle system (MRS), and much more. At Holosun, it's simple. We are obsessed with producing cutting-edge equipment with superior quality. Holosun is the industry leader in bringing feature-rich, high-quality products at a рrice that won't leave you stranded for ammo money. HS403B and HE403B-GR are 20mm micro sights designed for rifle and carbine applications. These sights feature Holosun's Super LED with 50k hour battery life and 12 reticle intensity settings. The housing of these rifle sights is made from 6061 aluminum and includes both a lower 1/3 co-witness mount (1.63") and a low mount (.75") for low-comb height rifle applications. Additional features include Shake Awake technology, digital buttons for setting changes, rubber lens covers, and a side-mounted battery tray for the 2032 battery. HS403B and HE403B-GR are versatile sights for users of all levels. Review: An outstanding red dot optic at a bargain price - Holosun has a well-deserved reputation for making quality red dot optics and the HS403B lives up to that reputation. It's attractive, very rugged, fairly easy to install and simple to operate. It has a wide range of adjustment for both windage and elevation, making it suitable for an equally wide range of firearms. The battery life is impressive and the "shake awake" auto-activation feature works exactly as advertised. Once zeroed, it holds zero without any issues. The red dot is crisp and easily visible. Its brighter settings are fully sufficient to make the dot visible in bright sunlight. My only complaint about this optic, and it's a very minor one, is that a basic 2 MOA red dot is the only reticle available. It would be nice to be able to select an "EOTech-style" reticle with a 2 MOA dot inside of a 65-68 MOA circle as an option. Given the sub-$200 price point for the HS403B, however, multiple reticle options is probably a bit much to ask. The simple red dot is sufficient for most shooting situations and the optic is, overall, an excellent bargain. Review: Nice red dot sight - Nice addition to my rifle. Easy to mount /adjust and use. Optic is high quality. All I can say is I really like it alot!! Quick delivery as well A+++++ ## Features - HOLOSUN RED DOT SIGHT - HS403B is a 20mm micro sight designed for rifle and carbine applications; It features Holosun's ultra efficient 650nm Red Super LED with up to 50k hour battery life and 12 reticle intensity settings; The housing is made from 6061 aluminum and includes both a lower 1/3 co-witness mount (1.63") and a low mount (.75") for low-comb height rifle applications; Lens cloth, rubber lens cover, T10 L key, and CR2032 battery included - SHAKE AWAKE TECHNOLOGY - Extends battery life by deactivating the optic's LED while not in use; Shake Awake offers settings from 10 minutes to 12 hours depending on the model and can be deactivated altogether if preferred; The slightest touch of the optic instantly reactivates the LED so your Holosun sight for rifle is ready when needed - MULTILAYER REFLECTIVE GLASS - This red dot sight for rifle is manufactured using optical-quality glass lenses with multilayer coatings applied to facilitate maximum light transmission and wear resistance while reducing glare and facilitating reduced power requirements; Holosun's highly reflective coatings produce industry-leading reticle intensity, clarity, and battery efficiency - SUPER LED - This micro sight for rifle is equipped with Holosun Super LED technology that provides a versatile range of reticle intensity settings; Holosun Super LEDs have ultra-efficient power usage creating battery like as high as 50,000 hours - SPECIFICATION - Reticle: Red 2 MOA; Light Wavelength: 650nm; Magnification: 1x; Parallax Free & Unlimited Eye Relief; Power Source: Solar & Battery; Battery Type: CR2032; Battery Life (Hours): 50000; Brightness Setting: 10 DL & 2 NV; Window Size: 20mm Diameter; Housing Material: 6061 T6 Aluminum; Adjustment per Click: 0.5 MOA; W&E Travel Range: ±50 MOA; Black Finish ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B01BJ3ZXD0 | | Aiming Scope Sight Pin Size | 2 Inches | | Best Sellers Rank | #68,278 in Sports & Outdoors ( See Top 100 in Sports & Outdoors ) #141 in Gun Sights | | Brand | HOLOSUN | | Brand Name | HOLOSUN | | Color | Black | | Compatible Devices | Rifle | | Customer Reviews | 4.7 out of 5 stars 1,493 Reviews | | EU Spare Part Availability Duration | 10 Years | | Global Trade Identification Number | 00760921087428 | | Included Components | Product | | Item Display Weight | 0.9 Pounds | | Item Type Name | Holster | | Item Weight | 4.32 ounces | | Magnification Maximum | 1 x | | Magnification Minimum | 1 x | | Manufacturer | Holosun | | Manufacturer Part Number | HS403B | | Material | Aluminum | | Material Type | Aluminum | | Model Name | HS403B | | Model Number | HS403B | | Mounting Type | Picatinny Mount | | Night vision | Yes | | Objective Lens Diameter | 20 Millimeters | | Product Style | Red 2 MOA Dot | | Reticle Type | Single Dot | | Sport | Hunting | | Sport Type | Hunting | | Style | Red 2 MOA Dot | | UPC | 760921087428 | | Warranty Description | 2 Year Manufacturer | ## Product Details - **Brand:** HOLOSUN - **Color:** Black - **Compatible Devices:** Rifle - **Item Weight:** 4.32 ounces - **Magnification Maximum:** 1 x - **Magnification Minimum:** 1 x - **Material:** Aluminum - **Objective Lens Diameter:** 20 Millimeters - **Sport:** Hunting - **Style:** Red 2 MOA Dot ## Images ![HS403B / HE403B-GR - Image 1](https://m.media-amazon.com/images/I/51EE-VWJ2ZL.jpg) ## Available Options This product comes in different **Color, Style** options. ## Questions & Answers **Q: Will this cowitness with my a2 front post? I don't mean a lower 3rd cowitness** A: No, not with the mount the optic ships with. It is compatible with Aimpoint T1 mounts, so full cowitness it definitely possible. **Q: Does this include the high rise mount AND a low base?** A: The HS403B comes with a high mount (lower 1/3 co-witness on standard AR sights) and a low mount.We are an AUTHORIZED distributor and the above answer came directly from HOLOSUN USA . Hope that helps ! **Q: Does this have the acss reticle, or just a dot?** A: Just a dot. **Q: Does this pair with the holoson hm3x magnifier? any special parts or spacers needed?** A: It should, but you can always call holosun... it’s free. ## Customer Reviews ### ⭐⭐⭐⭐⭐ An outstanding red dot optic at a bargain price *by R***L on June 29, 2024* Holosun has a well-deserved reputation for making quality red dot optics and the HS403B lives up to that reputation. It's attractive, very rugged, fairly easy to install and simple to operate. It has a wide range of adjustment for both windage and elevation, making it suitable for an equally wide range of firearms. The battery life is impressive and the "shake awake" auto-activation feature works exactly as advertised. Once zeroed, it holds zero without any issues. The red dot is crisp and easily visible. Its brighter settings are fully sufficient to make the dot visible in bright sunlight. My only complaint about this optic, and it's a very minor one, is that a basic 2 MOA red dot is the only reticle available. It would be nice to be able to select an "EOTech-style" reticle with a 2 MOA dot inside of a 65-68 MOA circle as an option. Given the sub-$200 price point for the HS403B, however, multiple reticle options is probably a bit much to ask. The simple red dot is sufficient for most shooting situations and the optic is, overall, an excellent bargain. ### ⭐⭐⭐⭐⭐ Nice red dot sight *by B***. on March 18, 2026* Nice addition to my rifle. Easy to mount /adjust and use. Optic is high quality. All I can say is I really like it alot!! Quick delivery as well A+++++ ### ⭐⭐⭐⭐⭐ Great rds for value *by Y***I on August 1, 2021* UPDATE: Still solid, no issues whatsoever. Red dot looks just as new as the first day, haven’t had any problems losing my zero or with the battery. I am thinking of eventually buying an aimpoint t2 just because is one the best rds you can get but it comes at a higher price. For now this holosun will keep on doing! Have shot it about twice now and 200 rounds later. Pretty accurate and easy to zero in. Have no trouble hitting targets at 50 or 75 yards. The dot is very clear, even in harshlight where the sun is at its brightest. Its affordable but it doesn’t feel like a cheap rds. Although I want to upgrade to an eotech holographic sight, this rds has been very nice and enjoyable to shoot with. Currently shooting a DD m4v7. ## Frequently Bought Together - HOLOSUN HE403B-GR / HS403B 2 MOA Dot Micro Sight for Rifles - Shake-Awake Super LED Durable Waterproof Aluminum Sight with Multilayer Reflective Glass & 12 Brightness Settings - Red/Green Dot Options - Streamlight 88066 ProTac Rail Mount HL-X 1000-Lumen Multi-Fuel Weapon Light with Remote Switch, Tail Switch, Clips, and CR123A Batteries, Box, Black - HOLOSUN HM3X 3X Flip-to-Side Magnifier w/QD Mount HM3X --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.co.uk/products/28163104-hs403b-he403b-gr](https://www.desertcart.co.uk/products/28163104-hs403b-he403b-gr) --- *Product available on Desertcart United Kingdom* *Store origin: GB* *Last updated: 2026-06-13*