Holosun 510C Review [Hottest Selling]

In this Holosun 510C review guide, let's check out its specs and see if it's worth the money over other available products.

Let's check it out

Holosun 510C Core Specs

  • Magnification - 1X
  • Reticle - 2 MOA + 65 MOA Ring
  • Adjustment - 0.5 MOA / Click
  • Brightness - 10 DL&2 NV
  • Battery Life - 50,000 hrs / 20,000 hrs circle dot
  • Construction - Titanium frame
  • Submersion - IP67
  • Body Dimension -3.3" X 1.68" X 1.78"
  • Window Size - 1.26" X 0.91"
  • Weight - 4.94 oz


holosun 510c unboxing
Holosun 510c on ar15

You get:

  • Holosun 510C
  • Manual
  • Additional battery tray
  • Cleaning cloth
  • 1 CR2032 battery
  • Allen key

First Impression

holosun 510c overall impression

The Holosun 510C is DEFINITELY NOT a cheap sight like the Sightmark Ultra Shot Reflex sight.

When Holosun 510C first came out, it's very easy for people to compare it with the Sightmark.

holosun 510c front lens

Now the 510C is right in front of me, and I can say it's a very rock solid product just by picking it up for the first time, very nice packaging, and very good overall build quality and coating finish.

holosun 510c solar panel

Now let's go in depth and see how this thing performs and how it compares to some of the top dogs like EOTech EXPS3 and Leupold LCO.

Holosun 510C Core Features

Window Size

holosun 510c pov window size
x95 with holosun 510c

The window size of the Holosun 510C is as big as an EOTech. Once the optic is mounted on a long gun, I never once got the impression that the window is too small for me to aim.

It has a large field of view and it helps shooters get on target fast and maximizes situational awareness. The ideal optic to eye distance with the Holosun 510C is similar to any other optics as long as it feels comfortable to the shooter.

Reticle Type

The Holosun 510C features a multi reticle system that serves shooters with aiming flexibility based on applications need.

The 2 MOA center dot gives shooters a clean dot for fast target acquisition and precise aiming point for long range engagement without covering up too much of a standard size target. It's as small as a 1 MOA, but not so small that you can't see it.

eotech 68 MOA ring reticle range estimation human size target

68 MOA is the same as 65 MOA

If you are not sure the difference between 65 MOA and 68 MOA, they are actually the same reticle one measures the outer ring diameter and the other the inner ring.

In addition, the 65 MOA ring mode gives shooters a larger aiming reticle for fast target acquisition, and it's just fast for the eyes to pick up compared to a 2 MOA only center dot.

On top of that the 65 MOA ring gives shooters range estimation capability just like EOTech's 68 MOA ring, and it can be used to represent a shotgun pellet spread pattern.

Reticle Clarity & Brightness Settings

65 moa ring reticle

Most shooters out there have astigmatism, and a perfectly good optic might appear to have starburst or smeared reticle reflected on the glass from the emitter.

holosun 510c pov reticle

For this review, I worn corrected lens and I also used my camera to check the clarity of the reticle. The result is that the reticle is very crisp, and if there is anything that looks blurry I had to blame my eyesight.

holosun 510c reticle emitter

For shooters with astigmatism, the reticle will look blurry and there are things you can do to counter that such as adjusting the brightness setting, cowitness the reticle through the rear iron sight peep hole, use a bigger dot and many more.

However, if none of these techniques have worked for you in the past, we highly recommend checking out a Prism sight for shooters with astigmatism.

Parallax Performance

A parallax free reflex sight is something companies often market to the users, but...

No optic is 100% completely parallax free

Generally the parallax shift is more noticeable when aiming at a target close up, and there is no better way to explain this than to show you below:

Battery Life

holosun 510c battery tray access

The battery tray holds a CR2032 battery that lasts about 50,000 hours plus solar panel that acts like a fiber optic under daylight to power the sight in the event the battery runs out.

holosun 510c battery

The solar panel will immediately power the reticle without a battery, but if it doesn't detect light or under the shade, it will turn off and requires button press to reactivate it when light returns.


The construction of the Holosun 510C is rock solid. 

You can view as many images online as possible, but once you hold one in your hands, you will very quickly realize this thing is well made.

cz evo s3 sbr with holosun 510c side view
holosun 510c lens hood protector

This is an open reflex red dot sight like the RMR without a protected lens on the back. The only down side of this design is that things can get inside the optic and fog up the lens or the emitter, which lead to reticle

This is definitely NOT a Sightmark clone.


The Holosun 510C comes with a quick release mount for fast optic attachment and detachment.

The part we like the most is the ability to lock the throw lever and the ability to tighten the screw for a rock solid mount in order to hold zero and prevent the optic from falling off the rifle.

holosun 510c mount bottom
holosun 510c qd throw lever hook
holosun 510c on kriss vector 9mm
iwi x95 with holosun 510c

The mount comes with the optic as one piece construction, and it sits just at 1/3 co-witness height, which works for most shooter on most long gun platforms.

If the shooter felt the optic mount height is short, please use a mount riser to lift the optic up for better sight picture 


holosun 510c elevation knob

The Holosun 510C features 0.5 MOA/click elevation and windage adjustment knobs, and both knobs can be easily adjusted with the tool provided in the packaging or use a small flat head screw driver.

However, the problem comes when you don't have a small flat head screw driver or the tool with you in the field to adjust the optic. 

Unlike Aimpoint and other sights where users can adjust the knob with a penny or a shell casing.

Final Verdict

holosun 510c on cz evo s3 sbr

If you're looking for another high quality reflex sights for a spare rifle laying around the house, the Holosun 510C is the best large window optic to buy. 

It's by far the best red dots under $310. It's also the best option for anyone starting out as a new gun owner because it's rock solid, better features than anything we had before without burning a hole in your wallet!


  • Rock solid construction
  • Very unique look
  • QD lever mount with locking feature & adjustable tension screw
  • Multi reticle system for various shooting applications


  • Open emitter can attract dirt