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Holosun 510C Review - A Value Packed Large Window Rifle Red Dot

Holosun 510C Review - A Value Packed Large Window Rifle Red Dot

Hey Freedom Gorillas, today we are going to review the Holosun 510C. This is one of Holosuns most most popular rifle red dot sights. It’s got a large window, comes in red or green reticles, has a quick disconnect mount, and an affordable price point.

We understand that not having these optics right in front of you can make it challenging to decide which is best for you, so our goal is to give you the information you need to decide if you want to purchase the 510C or not!

The red dot version in black or FDE is $309.99 and green dot version in black or FDE is $339.99. There is also red dot version with the Holosun 3X magnifier that is $484.99 - which saves you about $35. And if you ever wanted a green dot or FDE magnifier combo - reach out to us for a deal!

Holosun 510C Red & Green Dot Sights, FDE and Black color, Side View, Top View, Bottom View

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The Holosun 510C is a rifle optic that will attach to any picatinny rail or mount. It is an open reflex sight, has a solar failsafe, long battery life, shake awake, quick disconnect mount, and comes with Holosuns MRS reticle. It’s available in red or green reticles, FDE or black housing, has manual brightness, auto brightness, and a side removable battery. The 510C has an absolute co-witness mount, but a 1/3 spacer can be purchased here. The 510C is made out of 6061 aluminum and comes with a titanium shroud to add an additional layer of protect the glass. The 510C is an open reflex sight and is one of the nicest rifle red dot sights on the market.

Holosun 510c red and green fde and black boxes
Buy the 510C at The Best Price

Other quick stats and dimensions on the Holosun 510C are as follows:

  • Open Reflex Sight (Read more about open vs closed emitters optics here)
  • 1913 Picatinny Mounting interface
  • Quick Disconnect Feature
  • MRS Reticle, 65 MOA Circle + 2 MOA Center Dot, can be toggled to 2 MOA Dot only or 65 MOA outer ring only
  • 20K hrs of battery life with MRS Reticle, 50K hrs of battery with 2 MOA dot only
  • 12 Brightness Setting: 10 Daylight & 2 Nightvision Compatible
  • Manual & Auto Brightness Modes
  • Convenient Side Battery Compartment
  • 6061 Aluminum Housing with Titanium Hood
  • Solar Failsafe
  • Parallax-free & Unlimited Eye Relief
  • IP67 Waterproof
  • Shake Awake™
  • Multilayer Reflective Glass
  • 0.5  MOA Adjustment per Click
  • CR2032 Battery
  • Window Size: .91" High,1.26" Wide
  • Optic Size: 3.3"L, 2.31"H, 1.8"W
  • Weight: 7.6 oz (on our scale)

Holosun 510C Reticles

The Holosun 510C comes with Holosuns MRS reticle. Which is a 2 MOA center dot and a 65 MOA outer circle. The reticle can be toggled to have just the 2 MOA dot, just the 65 MOA outer ring, or both together.

To toggle reticles you hold down the “-” button for 3 seconds.

Holosun 510C MRS Reticle Toggle - How to change reticles - hold down the minus button for 3 seconds

The green reticle versions are slightly more expensive.

Holosun 510C MRS Reticle Example, 65 MOA Circle + 2 MOA Dot, 2 MOA Dot Only, 65 MOA outer ring only

Holosun 510C Pricing & Models

The Holosun 510C comes in red or green reticles, and is also available in black or FDE (Flat Dark Eath) housing color versions.

You can learn more about red vs green dots here.


Holosun 510C Red Dot Sight


Holosun 510C Green Dot Sight

Buy the 510C At The Best Price

Holosun 510C Dimensions & Size

  • Width: 1.8"
  • Length: 3.3"
  • Height: 2.31"
  • Window Size: 1.26" Wide, .91" Tall
  • Weight: 7.6 oz (on our scale)

Holosun 510C Intended Use

The Holosun 510C is intended for use on rifles, shotguns, or pistol caliber carbines (pccs), that have a picatinny rail or mount. It’s not intended for use on handguns as this is a large optic and has a rifle mounting interface picatinny 1913 rail.

In the Holosun 510C Box

When you open the Holosun 510C this is what you will find in the box:

  • 1x CR2032 Battery (installed inside the optic)
  • Holosun Warranty Card
  • Holosun T10L Key
  • Holosun Battery Tray & Windage & Elevation Adjustment Tool
  • Holosun Manual
  • 510C Optic
  • Lens Cloth
  • Spare Battery Tray
  • *Note: The Holosun 510C ships with an absolute co-witness mount only. If you wanted to make it a 1/3 co-witness you would need to get this 510C 1/3 co-witness spacer. Also worth noting, the 510C magnifier combo comes with the 1/3 spacer included.
Holosun 510C Unboxed - items included, warranty card, lens cloth, manual, torx wrench, battery tray, holosun tool

Holosun 510C Fitment Info

The Holosun 510C will fit onto any picatinny rail or mount.

The Holosun 510C comes with an absolute co-witness mount. This means it will line up directly with your iron sights. There is an 1/3 co witness spacer you can purchase here to make it a 1/3 co-witness. The Holosun 510C + Magnifier combo also comes with the 1/3 co-witness spacer.

Holosun 510C Review & Highlights

The Holosun 510C is one of the best selling rifle optics on the market and for good reason. It’s jammed with features, has a nice wide field of view, is durable, and comes in at a very affordable price point.

The nicest thing about the 510C is it’s quick disconnect mount and it’s large window. Looking through the large window is really pleasing. The glass is very clear and you are able to see a lot of target downrange.

Holosun 510C Mounted on Kel Tec CMR30, side view, angle, co-witness

The other nice thing about the 510C is it’s solar failsafe features. It has a solar panel so this means you can use it in auto brightness mode if you like, or you can use manual brightness mode as well. The solar panel allows this optic to work even if the battery dies or isn’t in the optic itself. It also has Shake Awake which turns the optic off after 10 minutes of inactivity, and turn it on the moment it senses movement.

The buttons on the 510c are tactile and large and easy to press. The quick disconnect mount is very convenient. Many optics are more expensive that have QD mounts, so the 510c including it standard is a nice value add.

The other cool thing about the 510C is it’s titanium shroud. This means if you were to drop the optic, the titanium outer shroud would act as a sacrificial layer to protect the glass. There is the titanium outer shroud, then the 6061 aluminum housing underneath.

The 510C also has long battery life, rated at 20k hours with the MRS reticle at setting 6 and 50k hours with the 2 MOA dot only. When you have to replace the battery, you just open the battery tray on the side and swap out the battery.

Holosun 510C Window Size, front and rear, reticle

The 510C is great for competition shooters, as the wide FOV allows you to see a lot downrange. It’s also a great option for home defense, hunting, or plinking.

We also like that the 510C is available in red or green reticles, and FDE and black housings. There aren’t many FDE red dots on the market, so having this one in that color is nice. It’s also nice that there is a 510c magnifier combo deal which saves you $35+ if bought together and also comes with the 1/3 co-witness riser.

Also if you ever wanted to create your own magnifier bundle with a green dot 510C reach out to us for a custom quote.

Holosun 510C Red Dot Sight FDE Holosun 510C Green Dot Sight FDE

Buy the 510C At The Best Price

Holosun 510C Downsides

The biggest downsides to the 510C are it’s weight and the fact it is an open emitter.

It weighs 7.6oz which is a little heavy for a non-holographic red dot sight, however compared to an EOtech it is still about 4oz lighter and is still one of the lightest large window red dots on the market.

The other downside is that it is an open emitter. This means that debris such as mud, dirt, dust, snow, rain, or anything else could get in the way of the emitter and the glass causing problems with accuracy or usability. You can read more about open vs closed emitter optics on our blog post here.

Open vs Closed Emitter Diagram - Rifle Red Dot Example

If this is a big concern for you and you still want a large window optic we recommend checking out the Holosun 512T, Holosun AEMS, EOtech's Holographic Red Dot Lineup, Holosun 530 series, and Vortex UH1

Holosun 510C Warranty

Holosun has a limited lifetime warranty. Basically everything is covered for the lifetime of the optic except for the electronics, that is covered for 10 years.

We’ve dealt with Holosuns warranty department and they are easy to deal with.

Also when you purchase from Freedom Gorilla, if you have an issue within 30 days we will replace the optic for you free of charge.


The Holosun 510C is one of the best values on the market when it comes to large window red dots at an affordable price point.

It is an open emitter which is a bit of a weakness, but if you are totally ok with that then it is a great option to mount on your rifle, pcc, or shotgun.

It has a great track record, and everyone we’ve talked to who owns one loves it. Once you look down the optic you will see how nice and pleasing it is to look through!

Thanks for reading and if you have any other questions please contact us.

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