Holosun HS403R Micro Red Dot Sight with Rotary‑Dial Brightness – 2 MOA, Shake Awake, Waterproof, IP67

Holosun HS403R Micro Red Dot Sight with Rotary‑Dial Brightness, IP67, CR2032 100,000‑h Battery

The Holosun HS403R red dot sight is a compact, 20 mm micro‑reflex sight built into an anodized 6061‑T6 aluminum body weighing only about 100 g, designed for fast, accurate target acquisition in sport shooting, hunting, and professional‑style platforms. The sight mounts on a Weaver‑style rail using removable low and high mounts (low: ≈36 mm; high: ≈41 mm), giving you flexible rail‑height options for co‑witness setups. The 2 MOA red dot sits in a multi‑coated optical system that is parallax‑free at all distances, providing a crisp, high‑contrast aiming point that stays consistent regardless of head position and eye relief.

A key feature of the HS403R is its rotary‑dial brightness control on the side instead of push‑buttons, which makes it easy to fine‑tune intensity on the fly while maintaining tactile feedback and sealing. The brightness system offers 12 levels: 10 daylight settings (values 3–12) and 2 night‑vision‑compatible levels (values 1–2), suitable for low‑light hunting or PNV‑assisted use. Behind the U‑shaped recessed adjustment turrets, the windage and elevation screws are protected from dust and impact, while the ±50 MOA adjustment range and 0.5 MOA per click (≈15 mm at 100 m) give you precise ballistic zeroing capability.

Advantages of the Holosun HS403R

• Uses an efficient red‑LED system that can deliver up to 100,000 hours (≈11 years) of operational life at moderate brightness on a single CR2032 battery.
• Delivers a 2 MOA red dot reticle ideal for quick target acquisition and medium‑range precision on rifles, carbines, pistols, and air‑guns.
• Features parallax‑free optics with multi‑coated lenses for high contrast and consistent reticle position at any distance and eye relief.
• Built with a 6061‑T6 aluminum body and IP67‑rated sealing, resistant to dust, water immersion up to 1 m, shock, and vibration up to 1000G.
• Offers a rotary‑dial brightness control with 12 levels (10DL + 2NV) for intuitive, waterproof brightness adjustment.
• Includes removable low (≈36 mm) and high (≈41 mm) Weaver‑style mounts, allowing flexible co‑witness configurations on different platforms.
• Compact dimensions of 70 × 36 × 41 mm and ≈100 g installed weight keep recoil and handling disruption minimal.
• The fully sealed, recessed adjustment turrets and internal‑engraved scale markings on the turret caps provide durable, repeatable zeroing under field conditions.

Technical Specifications – Holosun HS403R

Frequently asked questions

What is the Holosun HS403R red dot sight used for?
The Holosun HS403R red dot sight is a compact 20 mm micro‑reflex sight designed for fast, accurate aiming on rifles, carbines, pistols, air‑guns, and crossbows that use a Weaver‑style rail. Its 2 MOA red dot, 12‑level brightness control, and parallax‑free optics make it suitable for sport‑shooting matches, 3‑gun‑style drills, hunting in mixed‑light conditions, and general training where a lightweight, durable red dot is preferred over a heavier magnified optic.

How long does the HS403R battery last?
Holosun specifies up to about 100,000 hours of typical LED runtime on a single CR2032 battery at moderate brightness, which corresponds to roughly 11 years of continuous use under normal conditions. Even with frequent field use, this means the HS403R can stay in service for multiple European hunting and sport‑shooting seasons with very few battery changes, making it an exceptionally long‑life red‑dot‑sight option.

How does the rotary‑dial brightness control on the HS403R work?
The HS403R uses a side‑mounted rotary dial for brightness adjustment, with 12 distinct levels: values 1–2 for low‑light or night‑vision use, and values 3–12 for daylight‑brightness settings. This dial is recessed and sealed, so it remains weather‑protected and easy to turn with gloved hands, helping you smoothly adapt the 2 MOA red dot to changing light conditions without getting your hands dirty or opening the sight housing.

What is the difference between the low‑mount and high‑mount options?
The HS403R includes a low‑height mount (≈36 mm) for a flat‑top or low‑comb rail where the optic sits close to the bore line, and a high‑rise mount (≈41 mm) that raises the sight so iron‑sight aiming points, if present, sit in the lower third of the field of view (lower‑1/3 co‑witness). This choice lets you adapt the HS403R to AR‑style carbines, bolt‑action rifles, shotguns, or pistol‑platforms depending on your preferred sight‑picture style and hand‑guard setup.

Is the Holosun HS403R suitable for European hunting and sport shooting?
Yes, the HS403R is well suited to European hunting and sport‑shooting applications, where a compact, lightweight 2 MOA red dot reduces the need for heavy magnified optics. The IP67‑rated, 6061‑T6‑aluminum housing, 12‑level rotary‑dial brightness control, and up to 100,000‑hour battery life make it reliable for variable European light and weather, including cold, wet, and forest‑type environments.

If you want a compact, long‑life micro‑reflex sight with a tactile rotary‑dial control, Order the Holosun HS403R red dot sight and equip your European‑style rifle, carbine, pistol, or air‑gun platform with a Weaver‑rail‑mounted 2 MOA red dot shipped from Split, Croatia to the EU.

Comparison of Models

The HS403B uses a side‑mounted battery tray and the Shake Awake™ motion‑activated illumination system, which keeps the 2 MOA dot on standby and activates only when motion is detected, extending effective battery life to about 50,000 hours. It features digital push‑buttons for brightness control and a “last‑memory recall” that restores the previous brightness setting when the sight is powered back on.

The HS403C builds on the same core concept but adds a top‑mounted solar panel that works in parallel with the CR2032, allowing the dot to stay active almost permanently in daylight‑rich environments and extending functional life by combining long‑life LED, solar‑assist, and battery backup.

The HS403R, in contrast, introduces a rotary‑switch brightness control on the side instead of push‑buttons, making setting changes faster and more intuitive, and boosts battery life up to about 100,000 hours thanks to optimizations in the illumination and power‑management circuits, while retaining the 2 MOA dot, 10DL + 2NV brightness structure, and IP67‑sealed, closed‑tube design.

Advantages by model:

• HS403B – Best if you want motion‑activated, always‑ready convenience with Shake Awake™, simple button‑based controls, and a compact, low‑profile 403‑frame at a balanced price–performance ratio.
• HS403C – Ideal if you prioritize continuous‑on readiness with solar‑assisted operation, especially for home‑defense‑style setups or platforms you want to keep “always on” without constantly managing the power switch.
• HS403R – The best choice if you value very long‑life operation (≈100,000 hours), fast and tactile rotary‑dial brightness control, and a slightly refined ergonomic layout, while accepting a small increase in price over the HS403B/C variants.