Holosun HS503BU 2 MOA Dot & 65 MOA Circle Micro Red Dot Sight- HS503BU

More Views

Holosun HS503BU 2 MOA Dot & 65 MOA Circle Micro Red Dot Sight- HS503BU


Quick Overview

SKU: 5165449169
UPC: 605930624533
  • Magnification: 1x
  • Light Source: LED
  • Objective Diameter: 20mm
  • Reticle: 2MOA Dot & 65MOA Ring
  • Adjustment per Click: 1/2 MOA
  • Adjustment Range: ±50 MOA
  • Parallax Free: Yes
  • Unlimited Eye Relief: Yes
  • Multi-Coatings: Yes
  • Housing Material: 6061 Aluminum
  • Housing Finish: Black
  • Water Resistant: Yes
  • Shock Resistant: Yes
  • Battery Type: CR2032
  • Battery Life: Up to 50,000 Hours
  • Brightness Setting: 10 Daylight & 2 NV Compatible
  • Length: 2.44”
  • Width: 1.18”
  • Height: 1.63”
  • Weight: 6.3 oz.
  • Shake Awake: Yes

Add To:

The Holosun HS503BU is a new micro red dot optic equipped with a 65 MOA circle dot reticle with the option of switching to a 2MOA dot only. The “B” signifies that the battery is in an internal tray accessed through the side of the optic. The “U” signifies a housing design that shrouds the windage and elevation turrets on two sides Employing new LED technology, the lifetime for one CR2032 battery can reach 5 years on the 2 MOA dot. Holosun’s “Shake Awake” technology automatically turns the optic on at the slightest movement. When the optic senses no movement, it will go to sleep.



  • Designed for day and night use
  • New advanced technology LED allows up to 50,000 hours of operation on one CR2032 battery
  • 2 MOA on dot size
  • Reduced training time and ammunition
  • Unlimited field of view
  • Parallax-free with unlimited eye relief
  • Unaffected by extreme weather conditions
  • Durable and reliable construction
  • Low mount and 1/3 Co-witness mount included


Palmetto State Armory is your one stop shop for the best selection of Modern Sporting Rifle parts and accessories!

SKU: 5165449169
SKU 5165449169
Brand Holosun
Department Knives Optics Flashlights
Daily Deal No
Daily Deal Expires No
Unit Price N/A
Youtube Video No
Free Shipping? No
Free Shipping Qty Label No
Free Shipping Qty No
SKU: 5165449169

Questions and Answers

Start typing your question and we'll check if it was already asked and answered. Learn More
Browse 1 question Browse 1 question
This is the answer to the question SOMEONE is going to ask about Danbo's pictures of the "pushed in" front glass.
Mirrors, pool tables, angle of reflection... Does that mean anything?
The front glass is angled so the red dot can be projected at the center of the front glass and then be reflected back into your eye.
That's how it has to be to work.
It's not a QC issue.
Roy D on Sep 1, 2018


5.0 / 5.0
5 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Great optic
Good deal great optic
February 17, 2019
1 year ago
Good value, great features
So far it has worked as advertised. I was a little hesitant about trying holosun as I didn’t know much about the brand. In the end however, I was won over by the innovative features which many (very!) much more expensive optics lacked. I love the shake-awake and also the circle-dot reticle. It makes rapid close quarters target acquisition noticeably easier for me.
October 20, 2018
1 year ago
I love it! Sighted it in at 100 yards and was shooting 1 MOA groups.
October 20, 2018
1 year ago
I have a bunch of Holosun red dots and I love them all. Bought this one on sale with free shipping!
October 1, 2018
1 year ago
Great Product
I received a better sight than what I ordered probably because the one I ordered was out of stock. I'm very pleased with the sight and would recommend it.
October 1, 2018
1 year ago

Customers Who Viewed This Item Also Viewed