Holosun 507K Review: The Perfect Micro Red Dot for Subcompact Guns

by Dave Chesson

November 14, 2023



When it comes to micro red dot sights for subcompact handguns, the Holosun 507K stands out as a top choice. As a passionate firearms enthusiast, I’ve had the pleasure of testing this remarkable optic on my Springfield Hellcat. I’m excited to share my first-hand experience with this remarkable red dot sight. Let’s dive in and review why the Holosun 507k is becoming the go-to choice for subcompact handguns.

Holosun 507K Specs

  • Magnification 1x
  • BDC No
  • Battery CR1632
  • Dot Size 2 MOA dot & 32 MOA circle
  • Weight 1 oz

Specifications and Design of Holosun 507k

Before diving into my personal experience with the optic, let’s take a closer look at the Holosun 507K’s specifications and design. The micro red dot sight is specifically designed for compact pistols like the Glock 48 and SIG P365, offering a lightweight and slim option for concealed carry. We know Holosun for quality but affordable sights and some other micro red dot sights by them are Holosun 507k x2, Holosun 407k, and Holosun 507c x2.

The 507k has a multiple reticle system: a 2 MOA dot, a 2 MOA dot with a 32 MOA circle, and a 32 MOA circle only. This versatile selection caters to different shooting scenarios.

One of the standout features in the Holosun 507k is the side battery tray. The battery type used in the Holosun 507k is a CR1632. The compartment is accessible from the side, allowing you to replace the battery without removing the optic, preserving your zero. Up to 50,000 hours is the claimed battery life, but I’ve got some concerns about that—we’ll talk about it shortly.

The Holosun 507k also boasts a robust aluminum body, which outshines many other micro red dot sights in terms of build quality. It’s designed to withstand the rigors of daily carry and rapid movements without flickering dots (for civilian users, not the law enforcement). 

The 507K can co-witness with traditional height sights, making it compatible with various guns. This feature is particularly valuable for shooters who have not already invested in suppressor height sights. It also has a built-in rear sight. 

Okay, with that said, let’s jump into my thoughts about the Holosun 507k.

Holosun 507K Features

Holosun 507K Features
1 Brightness controls

Easy to access brightness controls buttons.

2 Built in sight

Built in rear sight works with standard height front sight incase your battery is dead.

3 Windage/Elevation adjustment

1 MOA windage and elevation adjustments for zeroing.

4 Battery tray

Side mounted battery tray allows you to replace the battery without removing the optic.

5 Reticle

The multiple reticle system allows the user to pick from 3 different options.

My Review of Holosun 507k

One of the standout features of the Holosun 507K is its clarity. The 2 MOA dot, along with the optional 32 MOA circle, offers a clear and crisp sight picture. It’s worth noting that the size of the dot may take some getting used to, especially if you’re accustomed to larger red dot sights. However, with practice, I found it to be highly effective for acquiring the reticle during the draw stroke.

The lens of the optic has a slight magnification, but it’s not noticeable during practical shooting.

However, I did notice a minor issue with a blurry red dot, similar to a “hairy red ball”. It’s not a deal-breaker, but it’s something to be aware of.

Shootability is where the Holosun 507K truly shines as a red dot sight. During my testing, I found it to significantly enhance accuracy, especially on subcompact firearms like my Hellcat. The ability to switch between three different reticle options allows you to adapt to various shooting scenarios. 

The 32 MOA circle-only reticle, in particular, excels in close-distance self-defense situations. It ensures that you can make accurate hits without the need for pinpoint precision. The co-witness feature with traditional height sights further aids in dot acquisition. This makes it a fantastic option for concealed carry pistol.

Based on my experience, the Holosun 507K is a reliable choice. It holds zero even after thousands of rounds and maintains a consistent, bright dot, even during rapid movement. I put this optic through its paces, and while it held up well, the battery life fell short of the claimed 50,000 hours. However, the optic did not fail during testing. My slight concern is the shake awake feature, which seemed overly sensitive, and might be the reason for the battery to drain faster. I do like the easy access battery tray, as this means you can change the battery without the hassle of removing and re-zeroing the optic. Honestly, that alone saved me so many headaches. 

They packed the Holosun 507K with features that cater to the needs of concealed carry enthusiasts. The inclusion of three reticle options, adjustable brightness settings, and the ability to lock your preferred settings in place makes it highly versatile. It is also incredibly easy to mount as it follows the industry standard for compact red dots–the Shield RMSc footprint.

The built-in rear sight serves as a reliable backup, ensuring that you can still aim accurately in case the optic fails. Now one thing to remember is that this optic is not made for duty, but if you are looking for a red dot sight for your subcompact, there’s nothing better than the Holosun 507k. 

Final thoughts on Holosun 507k

In my experience, the Holosun 507K is a top-tier micro red dot sight for subcompact guns, ideal for concealed carry applications. Its features, durability, and performance make it a top choice for subcompact handguns. That’s why I listed it as my best red dot sight for subcompact pistols in my review–you can check it out here

While there are some minor issues with it, such as the slightly blurry dot and battery life, they are not really a deal-breaker for me considering its benefits. This optic has earned its place as my go-to option for concealed carry and self-defense applications. So, give it a shot, and you won’t be disappointed.

Holosun 507K Pros and Cons 

  • Multiple reticles
  • Uses Shield RMSc footprint
  • Affordable price
  • Shake awake
  • Not duty rated

Report Card


The clarity is good and will distract you from seeing your target.


The 507k is a reliable optic, as long as you replace the battery at a higher frequency then suggested.


There a lot of great features packed in this small red dot sight that make it a great CCW optic option.


This small optic is great on sub compact guns, but it does come with a small window as part of the size constraints.


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Reviewed by Dave Chesson

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Based on 5 Reviews

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FAQ on Holosun 507k

How does Holosun 507k compare to other micro red dots in its class?

The Holosun 507k outperforms many competitors in terms of features, battery life, and durability. It’s considered superior to alternatives like the Shield RMS-C or the Sig Romeo Zero by many users.

What’s the battery life of Holosun 507k like in real-world usage?

While the claimed battery life is 50,000 hours, my experience suggests that the battery may need replacement sooner, around 5,000 hours. It’s advisable to change the battery annually to ensure reliability.

Is the Holosun 507K compatible with SIG P365 and Glock 48?

Yes, the Holosun 507K is 100% compatible with SIG P365 and Glock 48 pistols that are optic ready. It installs using two T10 Torx screws, which come with thread locker applied.

Is the Holosun 507K suitable for concealed carry?

Yes, the Holosun 507K is designed with concealed carry applications in mind. Its slim profile and durability make it an ideal choice for subcompact handguns and compact pistols. It’s been tested for drop resistance and retains zero after thousands of rounds, enhancing its suitability for concealed carry.

Can I use the Holosun 507K with traditional height sights?

Yes, the Holosun 507K can co-witness with traditional height sights. This is particularly advantageous if your handgun has a milled optic-ready slide. This eliminates the need for suppressor height sights.

Which reticle option is recommended for self-defense scenarios?

For self-defense purposes, the 32 MOA circle-only reticle is often recommended. It allows for quick and precise target acquisition at close distances, which is crucial in self-defense situations.


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About Dave Chesson

Dave Chesson is prior Navy with a specialty in international arms dealing for the US government across multiple countries. Having traveled the world and abided by ATF and ITAR, Roy has a unique background in legal as well as practical capabilities of weapons deployment and use.

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