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// 29.9.2023 GA4 add to cart // 29.9.2023 GA4 add to cart

Holosun 503R

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Holosun 503R Details

About the Holosun 503R micro red dot

Holosun 503R is a micro red dot sight of the Paralow series.

The letter 'R' indicates that the red -dot features a rotary switch for setting the illumination intensity instead of the two buttons found on most Holosun red dot sights. The switch is located next to the battery compartment, on the side of the red- dot. With the help of the switch, you can also switch between a 2 MOA dot and a MOA circle micro dot (multi reticle system).

Even though this red -dot doesn’t have ‘U’ in its name, red - dot comes with shrouded turrets.

"RD" indicates that this MOA red dot sight features red illumination.

"GD" indicates that this micro gold dot sight features gold illumination (gold dot Holosun).

Main features of 503R MOA red dot

  • micro red and micro gold dot illumination

  • multi reticle system - 2 MOA dot & 2 MOA dot surrounded by a 65 MOA circle micro gold or green - circle dot reticle

  • red - dot comes with a low mount and a high mount for a lower third co-witness on standard AR platforms

  • shrouded turrets on the red dot sight

  • rotary switch instead of buttons for setting the illumination intensity

  • same mounting platform as Aimpoint Micro devices ( Aimpoint micro mounting )

  • 12 illumination intensity levels, 2 of them are NVD compatible

  • red dot sight is parallax free

  • micro optical sight features up to 100.000 hours battery life

  • the battery compartment is on the right side of the product under a round shaped cover

About the Holosun Paralow series

Paralow is one of the red dot sight series made by Holosun. On the outside, these small tube sights are very familiar to the Micro red dot sights made by the famous Swedish red dot sight manufacturing company. The illumination is powered by a CR2032 battery. The click value for the elevation and windage adjustments on micro red dot is 0.5 MOA. These durable red dot sights feature a single-piece housing made out of aluminum. Altogether, there are 12 illumination intensity levels to choose from, 2 of which are NVD compatible. The battery life is 50.000 hours.

About the 503 model family

The 503 micro optical sight is one of the model families in the Paralow series. 

Reticle system on red dot sight

The first number '5' in its name suggests that the user can switch between a 2 MOA dot and a 2 MOA dot surrounded by a 65 MOA circle - circle dot reticle. The second number '0' implies that the red dot optic comes with standard accessories (without honeycomb filter, quick-release mount and flip-up lens covers).

Aimpoint micro mounting

These small tube sights come with a high mount for an AR platform (lower 1/3 co-witness) and a low mount for other mounting purposes (such as mounting on a rifle). All red dot optic models in the Paralow series except the ones with the letter 'A' in their name have the same mounting platform as the Aimpoint Micro devices ( Aimpoint micro mounting ). To read more about footprint on Holosun 503R red dot sight read our article Holosun 503R Footprint. You can also check our Footprint database

Warranty on Holosun red dot sights

The warranty is 3 years on the material and on the electronics of the MOA red - dot.

For more information regarding the Holosun symbols, check our blog post.

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Holosun 503R Specifications

Dot sight seriesHolosun Paralow
Made inChina
In production since2019
Warranty3 years
Click Value 5.0mm/100m - 0.05MIL
Windage - mrad. 14.53mrad
Windage - MOA.50MOA
Reticle2 MOA Dot, 65 MOA Ring
Reticle position No
Reticle illumination Yes
Usable at daytime Yes
Automatic Turn Off No
Size of Dot.2MOA
Adju. intensityYes
Intensity controlYes
Parallax setting Parallax-free
Length.69 mm
Width.39 mm
Height.41 mm
Working temperature range-30℃~60℃
Power Supply UnitCR2032
Battery lifespan.50000h
Filled with No
Lens coatings Fully Multicoated
Tube size/diameter 20 mm
Mounting StandardAimpoint Micro
Mount type - IntegratedFixed mount
Mount length.0mm
Size of windowNo
Dot Sight TypeSmall tube sight
Water proof IPX-6
Fogproof Yes
Shock proof501-1000 G
Type of mount rail Picatinny Mount


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