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Holosun HS503BU Micro Red Dot Sight

Holosun Circle Micro Red Dot Sight, 2 MOA Dot, 65 MOA Circle, Black, HS503BU
Holosun Circle Micro Red Dot Sight, 2 MOA Dot, 65 MOA Circle, Black, HS503BU
Holosun Circle Micro Red Dot Sight, 2 MOA Dot, 65 MOA Circle, Black, HS503BU
Holosun Circle Micro Red Dot Sight, 2 MOA Dot, 65 MOA Circle, Black, HS503BU
Holosun Circle Micro Red Dot Sight, 2 MOA Dot, 65 MOA Circle, Black, HS503BU
Holosun Circle Micro Red Dot Sight, 2 MOA Dot, 65 MOA Circle, Black, HS503BU
Holosun Circle Micro Red Dot Sight, 2 MOA Dot, 65 MOA Circle, Black, HS503BU
Holosun Circle Micro Red Dot Sight, 2 MOA Dot, 65 MOA Circle, Black, HS503BU
Holosun Circle Micro Red Dot Sight, 2 MOA Dot, 65 MOA Circle, Black, HS503BU
Holosun Circle Micro Red Dot Sight, 2 MOA Dot, 65 MOA Circle, Black, HS503BU
Holosun Circle Micro Red Dot Sight, 2 MOA Dot, 65 MOA Circle, Black, HS503BU
Holosun Circle Micro Red Dot Sight, 2 MOA Dot, 65 MOA Circle, Black, HS503BU
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Holosun Circle Micro Red Dot Sight, 2 MOA Dot, 65 MOA Circle, Black, HS503BU
Holosun Circle Micro Red Dot Sight, 2 MOA Dot, 65 MOA Circle, Black, HS503BU
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Holosun Circle Micro Red Dot Sight, 2 MOA Dot, 65 MOA Circle, Black, HS503BU
Holosun Circle Micro Red Dot Sight, 2 MOA Dot, 65 MOA Circle, Black, HS503BU
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Holosun Circle Micro Red Dot Sight, 2 MOA Dot, 65 MOA Circle, Black, HS503BU
Holosun Circle Micro Red Dot Sight, 2 MOA Dot, 65 MOA Circle, Black, HS503BU
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Holosun Circle Micro Red Dot Sight, 2 MOA Dot, 65 MOA Circle, Black, HS503BU
Holosun Circle Micro Red Dot Sight, 2 MOA Dot, 65 MOA Circle, Black, HS503BU
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Holosun Circle Micro Red Dot Sight, 2 MOA Dot, 65 MOA Circle, Black, HS503BU
Holosun Circle Micro Red Dot Sight, 2 MOA Dot, 65 MOA Circle, Black, HS503BU
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Holosun Circle Micro Red Dot Sight, 2 MOA Dot, 65 MOA Circle, Black, HS503BU
Holosun Circle Micro Red Dot Sight, 2 MOA Dot, 65 MOA Circle, Black, HS503BU
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Holosun Circle Micro Red Dot Sight, 2 MOA Dot, 65 MOA Circle, Black, HS503BU
Holosun Circle Micro Red Dot Sight, 2 MOA Dot, 65 MOA Circle, Black, HS503BU
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Holosun Circle Micro Red Dot Sight, 2 MOA Dot, 65 MOA Circle, Black, HS503BU
Holosun Circle Micro Red Dot Sight, 2 MOA Dot, 65 MOA Circle, Black, HS503BU
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Holosun Circle Micro Red Dot Sight, 2 MOA Dot, 65 MOA Circle, Black, HS503BU
Holosun Circle Micro Red Dot Sight, 2 MOA Dot, 65 MOA Circle, Black, HS503BU
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Holosun Circle Micro Red Dot Sight, 2 MOA Dot, 65 MOA Circle, Black, HS503BU
Holosun Circle Micro Red Dot Sight, 2 MOA Dot, 65 MOA Circle, Black, HS503BU
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Holosun Circle Micro Red Dot Sight, 2 MOA Dot, 65 MOA Circle, Black, HS503BU

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Questions & Answers
will this co witness with cz scorpion factory sights? Expert Answer

It may with the low mount, however the lower 1/3 cowitness mount is AR height and will most likely not allow you to cowitness with the CZ iron sights.

by Jonathan D., Gear Expert, May 13, 2019
Will this fit on a midwest industries ak mount for the primary arms, aimpoint base? Expert Answer

Yes, it is compatible with Aimpoint H1/T1 mounts.

by Jonathan D., Gear Expert, May 13, 2019
View All Q&A You Have a Question? Ask!
Customer Reviews
Helpful Positive Review
HOLOSUN 503BU by Red5, September 19, 2018
Are you going to battle ISIS in the Middle East? If the answer is "no" buy this red dot.... $157 bucks and free shipping... plus better features (shake awake, battery life) than EOTECH... HOLOSUN iis the leader here... and by the way the reticle look...
Read More...
2/2 found this helpful
Helpful Positive Review
Fantastic semi-budget red dot by Vince224, Verified Owner, September 29, 2016
Yes, it is made in China. No, it is not an Aimpoint. BUT, this thing is really, really good. The optical clarity is unbelievable (better than Aimpoint??). The swtichable dot / circle-dot reticle is the gold standard from my POV; no idea why other...
Read More...
13/14 found this helpful
Helpful Positive Review
Holosun HS503BU by Spencer, May 3, 2018
I just recently purchased this Optic and I couldn't be happier! The reticles are very clear and crisp as well as the glass. The sight itself is very durable and I can see myself having this sight for a very long time. I would strongly recommend. Can'...
Read More...
1/1 found this helpful
Helpful Positive Review
Best red dot for the money by Glockmeisterthreefiveseven, May 22, 2018
After running almost every red dot on the market I decided to take a chance on the Holosun for a budget AR pistol build. To my surprise the quality is outstanding, the glass is extremely clear, and has little to no glare. The shake awake feature is r...
Read More...
1/1 found this helpful
Helpful Positive Review
Great Optic by Ryan Hopkins, Verified Owner, March 15, 2018
Had this on my Ar before I purchased my ACOG. This is a great little sight. Auto on function with 5 year battery life for under 200!!! It has very clear glass and the option to switch between the 65 moa circle and the 2 moa dot is great.
3/3 found this helpful
Helpful Positive Review
Great Sight by TAV, December 11, 2017
Works as advertised. Easy to use, consistent, lightweight. The circle dot reticle is outstanding. No issues mounting or shooting with ease on my 7.62X39 AR SBR. After several trips to the range it appears to be an excellent value at $175. Enough said...
Read More...
4/4 found this helpful
Read All 35 Reviews

Product Discontinued by Manufacturer

Holosun HS503BU Micro Red Dot Sight has been discontinued by Holosun and is no longer available. Our product experts have helped us select these available replacements below.You can also explore other items in the Red Dot Sights & Accessories, Red Dot Sights yourself to try and find the perfect replacement for you!

Product Info for Holosun HS503BU Micro Red Dot Sight

The Holosun HS503BU 2 MOA Red Dot Sight is housed in a durable, aluminum housing that has a unique U-shape design that protects the windage and elevation turrets on two sides. Parallax free with an unlimited field of view, these Red Dot Sights by Holosun have an incredible battery life of up to 5 years on a single CR2032 battery located internally and accessible through the internal tray on the side of the optic. The Holosun HS503BU 65 MOA Circle Dot Scope features Shake Awake motion sensor technology that turns the optic on whenever movement is sensed and automatically shuts back off once the movement has subsided. For a reliable, versatile sight that will increase your accuracy and speed up your target acquisition, choose the Holosun HS503BU Parallax Free Red Dot/Circle Sight.image

Features of Holosun HS503BU 65 MOA Circle Dot Scope, 28Y-RD-HS503BU:

  • Shake Awake - Motion based on and off
  • 2 MOA dot & 65 MOA Circle
  • Reduced training time and ammunition
  • Unlimited field of view
  • Parallax-free with unlimited eye relief
  • Durable and reliable construction

Package Contents:

  • Holosun HS503BU Micro Red Dot Sight, 28Y-RD-HS503BU
  • Low Mount
  • 1/3 Co-Witness Mount
  • Adjustment Tool
  • Torx Key
  • Rubber Lens Covers
  • Extra Battery Tray

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Image of HOLOSUN HE510C-GR 1x 0.91x1.26in Reflex Red Dot Sight and HM3X 3x Magnifier Combo HOLOSUN HE510C-GR 1x 0.91x1.26in Reflex Red Dot Sight and HM3X 3x Magnifier Combo (4) List: $605.87 (Save 15%) $514.99
Image of HOLOSUN HE510C-GR 1x 0.91x1.26in Reflex Red Dot Sight and HM3X 3x Magnifier Combo HOLOSUN HE510C-GR 1x 0.91x1.26in Reflex Red Dot Sight and HM3X 3x Magnifier Combo (4) List: $605.87 (Save 15%) $514.99
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Image of Holosun 507 Pro Max Red 1x 1.18x0.98in Reflex Red Dot Sight Holosun 507 Pro Max Red 1x 1.18x0.98in Reflex Red Dot Sight List: $470.58 (Save 15%) $399.99
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Image of Holosun DRS-NV Digital Reflex 1-8x0.98-1.25 in Sight-Night Vision Sight Holosun DRS-NV Digital Reflex 1-8x0.98-1.25 in Sight-Night Vision Sight (13) List: $1,176.46 (Save 15%) $999.99
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Holosun HS503BU Micro Red Dot Sight Unavailable & Discontinued Models

List of Unorderable Models

  • Holosun Circle Micro Red Dot Sight, 2 MOA Dot, 65 MOA Circle, Black, HS503BU , MPN: HS503BU , UPC: 605930624533 , Code: 28Y-RD-HS503BU
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Last updated 2026-10-13 UTC.