HOLOSUN HS503R Red Dot Sight — Overview

Holosun HS503R — a compact, reliable, closed-type red dot (reflex) sight from the HOLOSUN brand, designed for intensive tactical use. The sight features a Multiple Reticle System (M.R.S.), which allows for quick switching between a 2 MOA dot reticle and a combined reticle: a 2 MOA dot within a 65 MOA circle, providing aiming flexibility in various conditions.

Illumination and Power

The model is equipped with proprietary Super LED red illumination with a wavelength of 650 nm and a battery life of up to 50,000 hours from a single CR2032 power cell. 12 intensity levels are available (10DL + 2NV), with the first two levels optimized for night vision or use with NVGs. The power cell is located in the rotary brightness adjustment disc, which is combined with the battery compartment for convenient battery replacement.

Construction, Materials, and Protection

The sight body is made of 7075 T6 aluminum with micro-arc oxidation. The sight is filled with inert gas (nitrogen) to prevent fogging of the optics and meets the IP67 protection standard. The Holosun HS503R has been tested for recoil resistance with a load of up to 1000 G. The optical coating is Fully Multi-Coated, which increases light transmission and image contrast.

Controls and Mounting

The rotary brightness adjustment disc is combined with the battery compartment. The mechanism for horizontal and vertical adjustments is implemented with turrets featuring protective caps. Two types of mounts for Weaver/Picatinny rails are included: Lower 1/3 Cowitness and Low Profile, allowing the sight to be installed on most types of weapons and ensuring compatibility with various aiming systems.

Technical Specifications

• Sight type: Red dot (reflex)
• Housing type: Closed
• Mounting: Weaver/Picatinny
• Lens size: 20 mm
• Reticle: 2 MOA dot; 2 MOA dot in 65 MOA circle (Multiple Reticle System, M.R.S.)
• Reticle color: Red
• Illumination wavelength: 650 nm
• Illumination intensity: 12 levels (10DL + 2NV)
• Power source: CR2032
• Battery life: Up to 50,000 hours (measured for dot)
• Gas purged: Yes (nitrogen)
• Coating: Fully Multi-Coated
• Housing material: Aluminum (7075 T6)
• Housing finish: Micro-arc oxidation
• Recoil resistance: 1000 G
• Adjustment range: ±50 MOA
• Click value: 0.5 MOA

Package Contents

• Red dot sight (with high mount)
• Low mount
• Rubber lens covers
• Power cell (CR2032)
• Tool kit
• Manual
• Lens cleaning cloth

Dimensions and Weight

• Sight dimensions: 65 x 68 x 40 mm (with high mount)
• Sight weight: 106 g
• Sight weight with high mount: 164 g
• Package dimensions: 123 x 92 x 80 mm
• Package weight: 382 g

The HOLOSUN HS503R is suitable for shooters seeking a compact, durable, and versatile red dot sight with multiple reticle options and long battery life. Thanks to IP67 protection, nitrogen gas purging, and a robust 7075 T6 housing, this sight effectively withstands harsh field conditions and intensive use. Brand: HOLOSUN. Product type: Military Equipment > Optics > Red Dot Sights.

Other technical and functional details — in the full specification above.

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