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Reviews & Ratings for Holosun HS510C 1x0.91-1.2in Open Reflex Red Dot Sight — 484 reviews

(484 reviews)
Holosun HS510C 1x0.91-1.2in Open Reflex Red Dot Sight
Holosun HS510C 1x0.91-1.2in Open Reflex Red Dot Sight
As Low As $309.99 Save 15%
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Expert Review

Solid Reflex Sight

by Matt S., Gear Expert from IL, United States Written on April 12, 2018
Pretty impressed with this sight.

Good sized window and while I mostly run the circle dot reticle, I like having the option to switch to just a dot reticle.

Controls are on the side and easy to use. Opposing side battery tray means you don't have to remove the optic to change the battery (not that you will need to be changing this battery often).

Green reticle is crisp and still visible in all but the brightest direct sunlight.

Indoors, upon opening the box, I noticed some glare/reflection when not looking directly through the optic. Seemed like an effect of the coatings. But once on the range, indoors or outdoors, it never was an issue or even really noticed.

The QD mount design isn't my favorite but it held up to my abuse without any issues.

Holosun is making some great advancements in the red dot market.
Most Helpful Positive Review First Impressions
Just received my HS510c in the mail after a 5 month wait, well worth it. The sight itself seems to be well built and fits snug on my upper receiver rail. It is important to note this is a REFLEX not a HOLOGRAPHIC sight. Holosun did their homework and managed to isolate the specific wavelength of the...
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Most Helpful Negative Review Too Complicated
This sight APPEARS to be well made, but I didn't keep it long enough to find out. Too many "bells and whistles". I had to keep referring back to the owners manual to change from manual to automatic. Never got around to trying to change reticle pattern. Couldn't even begin to imagine how I would reme...
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Hs510c holosun

by Jim, Verified Owner from CA, United States Written on May 1, 2026
Light weight, holds zero, large window. Does what its supposed to do.
Would recommend: Yes
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hS510C red

by Jim, Verified Owner from CA, United States Written on May 1, 2026
Light weight, large window. Does what i need it to do.
Would recommend: Yes
Was it helpful to you? Yes | No
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Awesome Red Dot

by Bplm26, Verified Owner from CO, United States Written on April 24, 2026
I like this one so much that I ordered a second one for my other gun. Large sight window. Clear view. Easy to Zero. I highly recommend the Holosun 510C red dot.
Pros:
  • GREAT PRICE
  • Large sight window
Cons:
  • None
Would recommend: Yes
Was it helpful to you? Yes | No
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Amazingly clear no shadow of optic blurt

by Boatboy, Verified Owner from PA, United States Written on April 17, 2026
Great optic! Would highly recommend this Holosun red dot
Would recommend: Yes
Was it helpful to you? Yes | No
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5/5 Rating

by Dan, Verified Owner from FL, United States Written on April 16, 2026
Great optic. Nice finish. Very well made. No need for mount or anything. Attaches directly to rail. Functions exactly how it should. Absolutely no disappointments with it.
Would recommend: Yes
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Great Red Dot

by Brian Pacheco, Verified Owner from CO, United States Written on April 9, 2026
I really like the large window. It makes it easy to locate the dot. The radical is just the right size. If I need a another red dot, I will certainly buy another one of these.
Would recommend: Yes
Was it helpful to you? Yes | No
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Great red dot

by A, Verified Owner from CO, United States Written on April 5, 2026
Works great as expected! Love the fde. Easy to install and take off. Live the big window. Makes spotting the red dot faster
Would recommend: Yes
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¹1211222222

by Ronnie, Verified Owner from WV, United States Written on March 31, 2026
Holosun Awesome � optics planet is great place to shop bang for you buck $$$$
Would recommend: Yes
Was it helpful to you? Yes | No
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Great Red Dot

by Big Fan, Verified Owner from VA, United States Written on March 22, 2026
This is the second 510c I’ve purchased in the last couple years and mounted on short barreled suppressed rifles. They are easy to adjust and very accurate. I have a total of three holosun sites and will be buying two 507k’s this week. I absolutely love the product line.
Would recommend: Yes
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Holosun HS510C

by Jhep, Verified Owner from KY, United States Written on March 10, 2026
Great red dot set up. Crisp optics. Nice features with solar power, shake awake & auto power off. The battery compartment removal is pretty tricky and needs some re- engineering. Overall, a suitable product for the price.
Would recommend: Yes
Was it helpful to you? Yes | No
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Last updated 2025-11-12 UTC.