Sights

Holosun 507c vs 507k – Pistol Optic Comparison

The 507’s is the medium-sized red dot series that Holosun offers. They are excellent as concealed carry optics or for use with full-size pistols such as the Glock-19. Finding the right optic that fits your use case criteria can take time and effort. Luckily this article will help you by highlighting the biggest differences and key features of both 507’s, and which one works best for which use application.  After testing both, I determined the HS 507c was the best option!

HuntersHalt: #1 Pick
 
4.5
4.0
  • Small & Compact Design
  • Multiple Reticle Options
  • Very Long Battery Life
  • Highly Durable Red Dot
  • Great Adjustability - 12 Brightness Settings
  • Clear Lens Quality
HuntersHalt: #1 Pick
4.5
  • Small & Compact Design
  • Multiple Reticle Options
  • Very Long Battery Life
4.0
  • Highly Durable Red Dot
  • Great Adjustability - 12 Brightness Settings
  • Clear Lens Quality
Lasso Brag

What Is The Holosun 507c?

HuntersHalt: #1 Pick
Holosun HS507C-X2 Reflex Red Dot Sight
4.5
Pros:
  • Small & Compact Design
  • Multiple Reticle Options
  • Very Long Battery Life
Cons:
  • Used Almost Exclusively On Pistols
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The Holosun 507C pistol optics forms part of the more extensive Holosun red dot series. It is an ideal red dot for medium to full-size pistol applications. Providing a rugged design with some excellent features. In fact, this is the red dot I used in my comparison of the Holosun hm3x vs hm3xt magnifiers!


What Is The Holosun 507k?

Holosun Sub-compact HS507K-X2 Red Dot Sights
4.0
Pros:
  • Highly Durable Red Dot
  • Great Adjustability - 12 Brightness Settings
  • Clear Lens Quality
Cons:
  • Smaller Field of View Than 507c
  • No Solar Power
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This red dot sight is a more simplistic red dot version of the HS507C, as it doesn’t feature a solar panel. The Holosun HS507K is a smaller sight than the HS507C, and is an ideal option if the user application is for concealed carry.


Main Differences Between Holosun 507k vs 507c

1) Quality Construction

Both these sights have the same quality construction parameters set out by Holosun. They are equally matched in terms of material, both are made from aircraft grade 7075-T6 Aluminum and have an anodized finish. Holosun makes top quality products & I saw that again in my comparison of the 508t & 507c red dots.

The HS507K has a more angular, square top design compared to the more bread loaf, rounded top shape design of the HS507C. These sights are equally matched in terms of quality construction.


2) Lens & Reticle Options

Both these sights have the same lens and reticle features. The lens is made from multicoated reflective glass, ensuring maximum glare reduction while allowing efficient light transmission. The sights are also scratch resistant to enhance their durability.

gun with HS 507c red dot attached

As an upgrade from the HS407 series, the HS507 series features Holosun’s Multiple reticle system (MRS), available in red and green reticles. The MRS is a system that enables you to switch between three MOA reticle options based on the situation you find yourself in. Be sure to read up about what does moa mean on a red dot. The reticle options are:

  • Circle Dot Reticle – 2 MOA dot surrounded by a 32 MOA ring (The flagship reticle option allows both speed and precision)
  • 2 MOA dot (small targets at greater distances)
  • 32 MOA Ring Reticle – 32 MOA ring with no center dot (shoot faster)

Both sights have 12 brightness settings, 10 daylight and 2 night vision. This adjustability stood out when I compared the Venom vs HS 507c red dots. The brightness settings are versatile, allowing an optimal clear sight picture even in the brightest and dimmest ambient lighting conditions. You can simply switch between the extensive selection of brightness settings using the easy to use buttons located on the side of the red dot.

They also have a brightness lock mode feature, enabling you to lock your favorite brightness setting so that when the sight is turned on via the shake awake technology, it will automatically load onto the brightness setting it is locked to.

 

The HS507K has an objective window size of 0.58×0.77 in, and the HS507C, measures 0.63×0.91 in. Thus, the Holosun 507K has a smaller window than the 507C. The HS507K and HS507C are parallax-free and provide unlimited eye relief.

The sights are similarly matched in terms of lens and reticle options. The only huge difference is with window size, the larger objective sight window size of the HS507C makes it the winner, as it gives a larger field of view, allowing for faster target acquisition. This is another reason that I rated the 507c as the Best Hellcat Optic from my testing.


3) Battery Life Comparison

The HS507K and HS507C use a standard CR1632 Lithium battery, easily replaceable from a side battery compartment. They are rated to last up to an impressive 50,000 hours on setting 6.

They both have shake awake technology, a great feature for saving battery life. The sight automatically switches off after a period of not detecting motion. When motion is detected, the sight will then automatically switch back on. The only difference is that the HS507C has a backup power source from a solar panel. You can also use the HS507C on the solar setting so that the battery life can last even longer. Battery life was also a determining factor when I compared the 407k vs 507k red dots in my testing.

 


4) Size and Footprint Comparison

These two sights were designed for different purposes, thus their size differs as well as their footprint.

The HS507K is designed as a red dot for CCW, and it works great for just that. It has a size of 1.6×0.98×0.95 in and weighs 1 ounce. The Holosun 507K has a Shield rmsc footprint, the standard footprint used for small, compact pistols. There are many different RMSC footprint red dots which will also work for this footprint.

The 507C is a larger red dot and is used on larger pistols than the HS507K. The size of the 507C is 1.78×1.15×1.15 in, and its weight is 1.5 ounces. The 507C uses the RMR footprint, the common footprint used for larger pistols.


5) Price Comparison

Holosun optics are priced very competitively in their specific market categories, and the 507C and 507K are no different. And just like we saw in our comparison of the Holosun 507c vs 407c, the 507C is a bit more expensive, which is understandable considering it is larger in size and has the solar panel feature. You can expect to pay a bit more for the green reticle.


6) Toughness Test

Holosun sights are some of the toughest on the market, they are made to survive almost anything you could throw at them. Both the HS507C and HS507K are built to withstand pistol recoil in their respective pistol size categories. The sights feature a shockproof capability of up to 5000G and are IP67 waterproof rated. This is why I rated Holosun as the Best Browning Buckmark Optics that I tested.

gun with HS 507k red dot mounted

Even though the solar panels of the HS507C are well protected and recessed into the sight, collision can still break them, so that is one thing to consider. The windage and elevation turrets, as well as the lock mode button, are recessed into the sight, to ensure that they are well protected from potential impact. The toughness challenge between the Holosun 507K vs 507C is pretty close, however the 507K wins this one. It is slightly more durable because it doesn’t feature solar panels – which means one less thing that might break.

 


7) Optic Accessories

To summarize, both these sights feature:

  • Stay awake tech
  • The multiple reticle system
  • A side battery compartment

The 507C also features a backup power source with its built-in solar panel.

The purchase includes 1x CR1632 battery, a lens cloth, and a user manual. In addition to this, the 507C also comes with a T10 L Key for adjusting the mount.


Best Use Cases For These Optics

The 507K is a small, compact red dot optic, making it ideal for concealed carry. It comes with the Shield RMS footprint, so it will work perfectly for your Springfield Hellcat or Canik TP9SF. If you want to know more about the best red dot sights available for the Hellcat, you can do so here, and for the Canik, here. If you’d like to put in the links for the other two articles Liam.

The 507C is excellent as a medium-sized red dot optic. It is versatile in its application, perfect for pistols and shotguns, competing with the Vortex Venom and the Trijicon RMR.


Which Red Dot Is Best?

If you are looking for a red dot to use with compact to subcompact pistols, then the 507K is the better option.

However, my personal preference is the 507C, for $30 extra, you get a larger field of view and a solar backup system, which can be crucial in a life-or-death situation.

 


Frequently Asked Questions

Does 507C have the same footprint as 507K?

No, the 507C has the RMR footprint meanwhile, the 507K has the Shield RMS footprint.

What does the Holosun 507K fit?

The Holosun 507K fits almost any compact pistol. It fits the Hellcat and Canik perfectly, as they both use the RMS footprint.

Is the Holosun 507C reliable?

Very reliable, the fact that it has a solar backup system in addition to its rated 50,000 hours makes this one of the most reliable red dot sights available.

Does the military use Holosun?

No, they use the Aimpoint Comp and EOTech red dot sights. However, more and more law enforcement officers are using Holosun on their pistols because it is reliable and durable.

What replaced the Holosun 507C?

The X2 replaced the standard Holosun 507C, as an improvement to the original design. The battery compartment is now located on the side instead of the bottom with the original 507C design. The relocation of the battery compartment makes it more user-friendly, as you do not need to detach the optic to replace the battery, so there is no need to re zero the sight. It also features the lock mode brightness settings feature, and the buttons are moved to accommodate the new feature addition.

The Bottom Line

These two optics live up to the standard set out by Holosun. They are reasonably priced, considering all the features that help these red dots obtain the exceptional performance they do. If you are searching for a new red dot sight for your gun, you should definitely consider one of these two sights!

HuntersHalt: #1 Pick
Holosun HS507C-X2 Reflex Red Dot Sight
4.5
Pros:
  • Small & Compact Design
  • Multiple Reticle Options
  • Very Long Battery Life
Cons:
  • Used Almost Exclusively On Pistols
We earn a commission if you click this link and make a purchase at no additional cost to you. Thank you for supporting us - we really appreciate it!

About the author

Patrick Howard

I have been working as a gunsmith for 20 years. Rain, fog, moisture, high temperature, or even snow are all the things a product must withstand in order to be recommended by me.

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