Holosun HS510C reflex sight
Travis Pike for TTAG

Ammo prices being what they are, I’ve taken to trying to review multiple items at a time to get the most out of my ammunition supply. While reviewing the Aero Precision EPC, I put on a Holosun HS510C and bam, now I get two reviews for the ammo cost of one. These days, you gotta do what you gotta do.

The Holosun HS510C happens to be a perfect optic for a pistol caliber carbine and seems to be popular with pro-level USPSA PCC shooters. Holosun has gained a lot of ground in the affordable quality optics market, and the HS510C seems to be one of their more popular options for rifle shooters.

Holosun HS510C reflex sight
Reviewing two products at once saves ammo in these trying times. (Travis Pike For TTAG)

This open design is soft of an EOTech style optic. However, the HS510C a red (or green) dot and not a true holographic sight. It replicates the open, square design of an EOTech with more affordable, lower-tech red dot technology. It’s basically a giant pistol optic that’s now rifle-sized. The emitter is open, and most of the design replicates pistol-style red dots blown up to rifle-sized optics.

HS510C Specs and Breakdown

When I say “lower-tech” red dot technology, I’m not slighting red dots. Anything that packs 50,000 hours of battery life isn’t going to be made fun of in my house.

The 2032 battery is the battery of choice for the HS510C. Fifty thousand hours is the battery life of the optic using the 2 MOA reticle, and like many Holosun optics, the HS510C offers a choice of reticles for the shooter.

Holosun HS510C reflex sight
Perfect for PCCS, and used by Pro USPSA shooters (Travis Pike For TTAG)

We get a 2 MOA dot, a 65 MOA circle, and a 65 MOA circle with 2 MOA dot combination.

Holosun HS510C reflex sight
Holosun HS510C reticle options (courtesy Holosun)

The circular reticles are great for shooters with astigmatism. They tend to be clearer and easier to see than a simple dot. Bigger reticles also drain the battery a bit faster, but you’re still getting tens of thousands of hours from a single battery.

To make sure you’re just about always good to go, Holosun has also installed a solar panel in the rear of the optic, and that adds some power backup to the optic.

Holosun HS510C reflex sight
The little Solar Failsafe panel works extremely well. (Travis Pike For TTAG)

I forget to turn optics off all the time, which will drain batteries fairly quickly. However, Holosun uses what they call shake awake technology. When the optic remains stationary for five minutes, it will automatically shut off. When the optic detects movement, the reticle jumps back to life.

The HS510C packs ten daylight settings and two-night vision settings.

Holosun HS510C reflex sight
The 65 MOA and 2 MOA dot were my favorite reticles of the Holosun HS510C’s multiple reticle system. (Travis Pike For TTAG)

The Holosun HS510C weighs 4.94 ounces, is 3.3 inches long, 1.8 inches wide, and 2.31 inches tall. When mounted, it sits high enough for an absolute co-witness. If you really want a lower third sight picture, you can purchase a spacer to raise the height.

Simple Ergonomics

The HS510C packs simple ergonomics. The battery tray is on the left side and easy to access. The + and – buttons control the brightness level as well as on/off and swapping the reticles through a combination of short and long presses.

Holosun HS510C reflex sight
These two buttons do it all. (Travis Pike For TTAG)

There are a few neat features to the HS510C. Double-tap the – button, and it instantly changes to night vision brightness levels. If you hold the + button, it will swap to automatic mode and allow the optic to decide your brightness level for you.

Holosun HS510C reflex sight
The QD switch on the Holosun HS510C can be locked and makes it an easy off and on option (Travis Pike For TTAG)

A standard QD mount allows for quick attachment and removal of the optic, and the lever locks down securely. The low weight and thin design make the HS510C a great lightweight carbine option. It’s sized well for a variety of weapons, including those with short rails like bullpups.

On the Range

Remember when I said it’s basically a giant pistol optic? Well, that goes for the turret adjustments as well. The turrets are set in and flush with the sight’s frame and require a flat head tool to make adjustments. It really is just like a big ol’ pistol optic. Still, Holosun includes a tool, so adjustments are easy, and they won’t easily get bumped off zero. Each click is half an MOA.

I did a 25/100 zero with the Holosun HS510C, which is my go-to for a PCC optic. Once the optic was dialed in, I started tinging and pinging steel. I shot with the 65 MOA circle combined with the 2 MOA dot for the majority of my shooting. I really love this reticle and find it versatile and useful.

Holosun HS510C reflex sight
Getting some behind cover shooting in (Travis Pike For TTAG)

It’s a big reticle that’s easy to see and very crisp and clear. Big reticles catch your eye quickly and allow you to see your target at a wide variety of ranges. It’s spread out just enough to avoid being crowded. Shooting multiple targets of varying sizes at a number of distances is easy to do.

Going from IPSC sized steel targets to clay pigeons on the fly takes little skill with the HS510C. The big 65 MOA circle allows me to land fast shots on the big target, and the 2 MOA dot makes precise shots on small targets possible.

Holosun HS510C reflex sight
The Holosun HS510C is ust like a big pistol red dot.  (Travis Pike For TTAG)

It’s also more useful and versatile. At super close ranges, I can use the bottom stadia to compensate for height over bore compensation. It’s a great design for both close-range use and moderate range use.

Playing with ‘Modes’

The automatic brightness mode works, but it’s not something I’ll use often. It only compensates for the light around you. So if you are in a shaded area, but the target is in a bright area, the reticle probably won’t be bright enough. Also, the automatic mode won’t compensate for the use of a weapon-mounted light.


I’ve used the HS510C on two rifles, the Aero EPC you see here, and the CZ Scorpion bullpup I’ve reviewed previously. The HS510C was easy to re-zero between rifles, and between the two, the optic never lost zero.

Holosun HS510C reflex sight
A little damage to the finish was all she wrote. (Travis Pike For TTAG)

Between the guns, the HS510C has seen at least a thousand rounds (which makes my wallet and ammo stash very sad). No issues have arisen in that span, and the optic keeps on keeping on. I even popped it on an ASP training gun and dropped it a few times. The only damage was some abrasions to the finish.

Holosun HS510C reflex sight
Holosun really loves their labels (Travis Pike For TTAG)

The HS510C has an IP67 rating. That means it’s sealed from dirt and debris, as well as water up to half an hour in one meter of water. The sight is well-sealed and seemingly pretty tough for the money.

The HS510C is rather affordable with plenty of features providing a lot of optic for the money. It’s well-suited to use on carbines of all types, and even shotguns could be equipped with such an optic.

Specifications: Holosun HS510C Reflex Sight

Dimensions – 3.3×1.68×1.78
Weight – 4.94 ounces
Mount – Integral QD
Brightness Levels – 10 DL 2NV
Battery Life – 50,000 Hours
Battery Type – 2032
MSRP: $364.69 (about $310 retail)

Ratings (Out of 5 Stars):

Durability: * * * *
It’s not sealed like an ACOG or an Aimpoint for Navy-SEAL-Secret-Squirrel heavy use, but for 99.99% of users, it’s going to last a lifetime of normal use. It’s water resistant, quite durable and well made.

Optics: * * * *
There’s a slightly noticeable blue tint to the multi-layer reflective glass. Not that unusual in reflex sights of this type and price point. Other than that, it’s sharp and clear from edge to edge.

Ergonomics: * * * *
The controls and ergonomics are sound. The optic doesn’t offer anything ambidextrous, but nothing about the HS510C’s controls is tough to reach or activate. The buttons are large enough and provide good tactile feedback.

Overall: * * * *
The Holosun HS510C is a very solid little optic. It’s well-made, easy to use, and packs a ton of optic features in an affordable package.

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