Holosun Micro Sight, Green Circle / Dot Reticle with Shake Awake - HE503GU-GR

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Holosun Micro Sight, Green Circle / Dot Reticle with Shake Awake - HE503GU-GR

In stock

Regular Price: $ 271.49

Special Price $ 199.97

Quick Overview

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SKU: 52668
UPC: 605930624786
  • Light Source: LED
  • Reticle: 2MOA Dot & 65 MOA Ring
  • Parallax Free: Yes
  • Unlimited Eye Relief: Yes
  • Magnification: 1x
  • Multi-Coatings: Yes
  • Battery Type: CR2032
  • Battery Life: Up to 50,000
  • Solar Power Alternative: No
  • Brightness Setting: 10 Daylight & 2 Night Vision Compatible
  • Housing Material: 6061 Aluminum
  • Adjustment per Click: 0.5 MOA
  • W&E Travel Range: + - 50 MOA
  • Weight: 6.3 oz
  • Height: 1.63”
  • Length: 2.44”

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The HE503GU-GR Elite is a new micro green dot optic equipped with a 65 MOA circle dot reticle with the option of switching to a 2MOA dot only. The “G” signifies that the battery is side mounted on the side of the optic. The “U” signifies a housing design that shrouds the windage and elevation turrets on two sides. Employing new green LED technology, the lifetime for one CR2032 battery can reach 5 years on the 2 MOA dot.

Shake Awake™

     Another great piece of technology created by Holosun is Shake Awake™. This great feature allows an optic to automatically go to sleep when the unit has not detected any type of movement or vibration in a specific amount of time that is programmable by the operator. However, once the unit senses movement, it will automatically turn itself on and recall the last brightness that was used. This great feature helps promote battery life further and ensures the unit is on and ready when you need it!

  • 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


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SKU: 52668
SKU 52668
Brand Holosun
Daily Deal No
Daily Deal Expires No
Youtube Video No
Free Shipping? Yes
Free Shipping Qty Label No
Free Shipping Qty No
SKU: 52668

Questions and Answers

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Browse 3 questions Browse 3 questions and 3 answers
So this is water proof?
Sarge on Aug 30, 2018
BEST ANSWER: Yes, IP67 so submersible to 1 meter for about 30 minutes
Does it come with lens covers?
Joe C on Sep 6, 2018
Is the mount height setup for co-witness? Or lower 1/3?
22LR-AR15 on Oct 18, 2018
BEST ANSWER: Comes with the lower 1/3 mount attached but it also comes with the absolute co-witness mount in the box.


4.2 / 5.0
11 Reviews
5 Stars
4 Stars
3 Stars
2 Stars
1 Star
Great optic!
So far I love this sight. I have a few hundred round with it now an is holding zero. I chose this optics mainly for the shake away feature since I keep this firearm in my truck and didn't want buttons to push if I needed it in a hurry. Would most definitely recommend.
April 17, 2019
3 months ago
Excellent device for rapid target engagement and longer distant shooting. Extremely durable!
An excellent green dot that is bright, crisp, and extremely fast to target with. It allows quick, rapid acquisition with the large circle for CQB work and longer range precision work with the 2 MOA dot. I’ve used it with 1000s of rounds being shot and never had an issue. Would buy again and again.
User submitted image
Added Feb 5, 2019
February 5, 2019
8 months ago
Piece of junk
What a piece of junk. New out of the box,the sight would turn off after EVERY SHOT. Now the wait for holosun to replace it.
January 25, 2019
As functional as can be
My 503GU had issues out of the box and after a quick email to Sean Holloway of Holosun's California office, I had a pre-paid RMA and 7 days later, a new unit which worked perfectly. However, my 503GU-GR has functioned flawlessly from day 1 and I have the comfort of knowing that this unit is one of their "Elite" models and has a vastly extended warranty included.

If, in the next decade, I have any issues with this unit, I know who to contact and the speed in which they will handle the warranty work. On the item itself:

This item is lightweight, clear as a bell, and extremely dynamic. The w&e adjustment knobs have a solid and tactile click and are inset into the aluminium frame for protection from abuse. The auto-wake feature is extremely sensitive and even a gentle tap with my pinky finger brings it right back from sleep in the same brightness setting it was previously on. I must admit, I like this feature over my Eotech that must be manually activated and adjusted before each use. The Eotech has a larger viewing window, but also weighs nearly three times as much. I bought this for use on my Extar EP9 which is a pistol caliber carbine that costs $400 and weighs under 4 pounds. I simply couldn't justify spending the money for another Eotech or adding nearly a full pound for the optic on this gun.

A friend of mine sat down to shoot it @ 50 yards and grumbled "I hate that complex reticle thing. I just want a dot." I held down the "-" button to switch reticles and his eyebrows raised. He then said "Well sh&t... That's kinda cool. How much was that thing?" I told him the price and he was impressed. He spent a full 10 minutes fondling it and playing with the settings before cranking into the next string of shots. We discussed at length the situations where the circle-dot reticle would be useful and when it would not. We both agreed that indoors CQB would behoove the larger reticle, but we disagreed about it's use at longer range. I like the ability to "size" my target to know distance with the circle-dot and he preferred not to be distracted or have his view obscured by the 65 MOA ring. The great news was, this optic could please both of our preferences. We found that sunny day shooting was easy to function at brightness level 8, when it was raining level 5, in pitch black level 3, or pitch black with 600 lumen flashlight active level 5. We briefly tested the two night vision brightness levels and they were more than adequate.

Comparing this to the Eotech isn't apples-to-apples, I know; However, that is my (now second) favorite optic, so I will compare them.
Eotech XPS2-0 pros: Made in USA, Window size, Thick polycarbonate lens, Lifetime Warranty
Holosun 503GU-GR pros: Battery life, Auto sleep/wake, Lightweight, Clear reticle, Reticle choice, Easy access buttons, W&E adjustment knob covers, More common battery, No thermal shift, Far less expensive

I've been thoroughly impressed by both this optic and the Holosun customer support. I would not hesitate to purchase from this company again. (For those who might argue about the "common battery" line, please note: CR2032 batteries are in almost all computers, electronic car key fobs, garage door remotes, cable tv boxes, and more)
January 15, 2019
6 months ago
Nice crisp green dot
I haven't had a chance to actually shoot with it yet but after going from shop to shop looking at red dots I settled on the Holosun green dot. I inherited bad vision then to top that off it was made worse after an eye injury as a kid so my vision is a hair away from legally blind which made actually seeing the red dots in person necessary and this was the sharpest I found by a good margin. Just comparing dot to dot it was easier to see than Vortex (next best), Sig, Sightmark and Bushnell for me and I can't exactly explain how but the circle also makes the dot even more clear for me like it focuses it somehow but if the shooting community is roughly like the people I deal with on a day to day basis most people's vision isn't as bad as mine. Can't say that everyone will have the same experience but for me this was one of the two brands that I was able to see without a huge tail or star burst effect plus the auto off/on features are nice.
December 12, 2018
6 months ago
Great green got
At first, I had trouble changing the reticles. Holosun changed it out for a new one, quickly. I absolutely love the green dot. I recommend this to anyone.
December 9, 2018
6 months ago
Great product! Holds zero and has a nice clean crisp green dot. Highly recommend!
This is a great optic! Purchased for my 7.5" PSA AR Pistol and it works flawlessly. Didn't take much to get it zeroed in and after a few trips to the range it held zero without any other issues. The green dot is definitely top notch and highly visible even on the sunniest of days. I will be looking to PSA and Holosun for my next optic.
Great optic on my PSA AR Pistol.
Great optic on my PSA AR Pistol.
November 14, 2018
8 months ago
5 Stars
It is a wonderful sight.
I plan to order 2 or 3 more when my finances allow me to
November 4, 2018
8 months ago
Great for Day use, Not Compatible for NV Optics, at all
This Optic was what I thought was going to be the Perfect Fit for a 300 Blackout pistol, because I can See the Green Dot Much Easier than the Red Dot. This is advertised as having 2 Settings for NV Use, but to My Disappointment when I got time to try it with a NV Optic! It has the 65 MOA Reticle that Goes around the 2 MOA Green Center Dot, and even on the Lowest setting to My Surprise Does Not Dim Down Low Enough to leave a Clear Crisp Center Green (or Amber Dot) that’s Compatible for NV use. The Outside part of the reticle stays at the same Light Level as the Center Dot and Drowns Out the Dot even on the Lowest Setting, Leaving a Blurry Field of View Unable to See thru the Optic I’ll have to Upgrade to an Aimpoint and maybe return this Optic?
October 31, 2018
Great product. Adjustments work great. Easy mount.
October 11, 2018
8 months ago

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