Holosun 507K Vs Holosun 508T

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Welcome to my comparison of Holosun 507K Vs Holosun 508T.

I’m diving into an in-depth comparison of two popular options in the market: the Holosun 507K and the 508T. My aim is to test these sights under various conditions, analyzing their features, performance, and overall suitability for different shooting scenarios. 

FeatureHolosun 507KHolosun 508T
Housing Material7075 AluminumGrade 5 Titanium
Power SourceBattery (CR1632)Solar & Battery (CR1632)
Battery LifeUp to 50k hoursUp to 50k hours
Solar FailsafeNoYes 
ReticleRed 2 MOA Dot & 32 MOA CircleRed 2 MOA Dot & 32 MOA Circle
Window Size0.58×0.77 inches0.63×0.91 inches
W&E Travel Range±30 MOA±50 MOA

Overview: Holosun 507K

The Holosun 507K X2, designed for subcompact pistols, combines advanced technology with user-friendly features.


  • Red Super LED, up to 50k hour battery life
  • Multi-Reticle System (MRS)
  • Shake Awake Technology
  • Lock Mode for button settings security
  • Reticle: Red 2 MOA Dot & 32 MOA Circle
  • Battery: CR1632
  • Housing: 7075 Aluminum
  • Brightness Settings: 10 DL & 2 NV
  • Window Size: 0.58×0.77 inches
  • Adjustment per Click: 1 MOA
  • W&E Travel Range: ±30 MOA

Overview: Holosun 508T

The HE508T-RD X2 stands out with its grade 5 titanium housing and solar backup, aimed at hard-use handgun applications.


  • Ultra-efficient 650nm Red Super LED
  • Multi-Reticle System (MRS)
  • Shake Awake Technology
  • Solar Failsafe with Auto Mode
  • Grade 5 Titanium Housing
  • Reticle: Red 2 MOA Dot & 32 MOA Circle
  • Power Sources: Solar & Battery (CR1632)
  • Battery Life: Up to 50k hours
  • Brightness Settings: 10 DL & 2 NV
  • Window Size: 0.63×0.91 inches
  • Adjustment per Click: 1 MOA
  • W&E Travel Range: ±50 MOA

Features Comparison of Holosun 507K VS Holosun 508T

1. Housing Material and Durability

Holosun 507K

The 507K’s housing, made from 7075 Aluminum, is remarkably sturdy for its size. During my field tests, it proved to withstand various conditions without any issues. Although it’s not titanium, the aluminum construction is robust enough for most handgun applications.

It’s lightweight yet durable, a crucial factor for subcompact pistols where extra weight can throw off balance. In my experience, this housing held up well, maintaining its integrity even after rigorous use.

Holosun 508T

On the other hand, the Holosun 508T, crafted from grade 5 titanium, offers superior durability. Its hard-use design is evident when tested in rougher conditions. The titanium housing not only adds to the overall resilience but also gives a premium feel. 

In my testing, this sight endured more extreme conditions than the 507K. This robust construction makes it an ideal choice for shooters who demand the utmost in durability and reliability.


Holosun 508T’s titanium housing provides unmatched strength and durability compared to the aluminum body of the 507K.

2. Battery Life and Power Options

Holosun 507K 

The 507K boasts a battery life of up to 50,000 hours with its CR1632 battery. What impressed me most was its efficient power management, thanks to the Shake Awake technology. It conserves battery life by deactivating the LED when not in use. 

However, it lacks an auto-brightness feature, which could be a downside for some shooters. In my tests, the battery performance was reliable, but manual brightness adjustment was sometimes necessary.

Holosun 508T

The 508T steps up the game with its dual power sources: a CR1632 battery and Solar Failsafe. The solar option is a game-changer, providing a backup power source and auto brightness adjustment based on lighting conditions. 

During my field tests, I found this feature incredibly helpful, especially in varying light environments. The battery life is equally impressive, matching that of the 507K.


Holosun 508T’s addition of Solar Failsafe and auto brightness adjustment gives it an edge over the 507K.

3. Size and Suitability for Different Firearms

Holosun 507K

The 507K’s compact size (0.58×0.77 window size) is perfect for subcompact pistols. It’s small, unobtrusive, and doesn’t add unnecessary bulk.

During testing, I found it to be an excellent fit for smaller handguns, maintaining balance and handling ease. Its RMSc footprint is ideal for shooters who prefer a minimalistic yet effective sight.

Holosun 508T

The 508T, with a slightly larger window size (0.63×0.91), is more versatile. It works well on handguns with RMR footprint, offering a broader field of view. 

In my tests, it performed exceptionally on larger firearms, where the extra size provided a more expansive sight picture. This versatility makes it a great all-rounder, though it might feel a bit more cumbersome on smaller pistols.


Holosun 507K is a winner for shooters who prioritize a compact, lightweight sight specifically for subcompact pistols; the 507K’s smaller size is a clear advantage.

4. Reticle Options and Versatility

Holosun 507K

The 507K’s Multi-Reticle System (MRS) offers a 32 MOA circle with a 2 MOA dot, allowing for quick target acquisition at shorter distances. The option to switch between a large circle, a dot, or both provides flexibility based on shooting preferences. 

In my field tests, this versatility proved beneficial in various scenarios, especially in rapid-fire situations where the larger circle helped in quicker target alignment. The reticle remained crisp and clear, enhancing my shooting accuracy.

Holosun 508T

Similarly, the 508T features the same MRS as the 507K. However, the slightly larger window of the 508T provides a broader view, which I found advantageous during testing.

The reticle options were equally effective, offering the same versatility as the 507K. The larger field of view made target tracking easier, especially in dynamic shooting environments.


It’s a Tie. Both models offer excellent reticle options and versatility, with the 508T having a slight edge in the field of view.

5. Ease of Use and Interface

Holosun 507K

The 507K features a straightforward and intuitive interface. Its Lock Mode, which prevents accidental setting changes, is a great addition. 

During testing, I found this feature particularly useful, as it ensured my settings remained consistent throughout. The side-mounted battery tray also made battery replacement easy, without the need to dismount the sight.

Holosun 508T

The 508T also includes Lock Mode and a user-friendly interface. Its added Solar Failsafe technology automatically adjusts reticle brightness, which I found to be a significant advantage in varying light conditions. 

The interface was easy to navigate, and the automatic brightness adjustment reduced the need for manual changes, allowing me to focus more on shooting.


Holosun 508T’s Solar Failsafe technology adds an extra layer of convenience, making it more user-friendly.

6. Weight and Portability

Holosun 507K

The 507K, designed for subcompact pistols, is lightweight and compact. This makes it an ideal choice for shooters who prioritize portability. During testing, the 507K added negligible weight to my handgun, maintaining the firearm’s balance and handling.

Holosun 508T

The 508T, while still reasonably lightweight, is slightly heavier due to its titanium construction and larger size. This added weight might be noticeable on smaller firearms but is generally well-balanced on larger handguns. 

In my tests, the 508T’s weight did not hinder performance but provided a more substantial feel.


Holosun 507K’s compact and lightweight design is more suited for shooters who need a portable and unobtrusive sight.

Pros & Cons of Holosun 507K


  • Lightweight and compact design ideal for subcompact pistols.
  • Durable 7075 Aluminum housing.
  • Multi-Reticle System (MRS) offers versatility.
  • Shake Awake technology extends battery life.
  • Side-mounted battery tray for easy replacement.


  • No auto brightness feature.
  • No Solar Failsafe

Pros & Cons ofHolosun 508T


  • Robust grade 5 titanium housing suitable for hard use.
  • Solar Failsafe and battery power sources.
  • Multi-Reticle System for varied sighting needs.
  • Shake Awake technology for efficient power management.
  • Larger window size offers a broader field of view.


  • Potentially too large for some smaller handguns.
  • The circular reticle may appear canted in rare cases.

Similarities between Holosun 507K & Holosun 508T

  • Both have a Red Super LED with up to 50k hour battery life.
  • Equipped with Holosun’s Multi-Reticle System.
  • Feature Shake Awake technology.
  • Offer 1x magnification and parallax-free sighting.
  • Provide a red 2 MOA Dot & 32 MOA Circle reticle option.

Differences between Holosun 507K & Holosun 508T

  • 507K is made from 7075 Aluminum, 508T from grade 5 titanium.
  • 508T includes Solar Failsafe, not present in 507K.
  • 507K is more compact, 508T has a larger window size.
  • 508T has a wider W&E Travel Range (±50 MOA) compared to 507K (±30 MOA).

Final Verdict & My Choice

After thoroughly testing both the Holosun 507K and the 508T, I’ve concluded that the Holosun 508T is the superior choice for most shooters. 

Its robust grade 5 titanium housing, combined with the innovative Solar Failsafe technology and a larger window size, makes it versatile for a wide range of firearms and shooting conditions.


What is the difference between 508T and 507C X2?

The main difference is that the 508T has a square-shaped window and titanium housing, making it more durable, while the 507C X2 is made of 7075 T6 Aluminum.

What is the difference between Holosun 508T and 407C?

The 508T X2 features an MRS Reticle (multi-reticle system) and 20k hours of battery life with MRS, while the holosun 407C X2 has a 2 MOA dot only and 50k hours of battery life.

What is the difference between 508T and 509T?

The 508T X2 is an open emitter with an RMR footprint, whereas the 509T X2 is an enclosed emitter and uses a clamping mechanism design.

Is the Holosun 508T waterproof?

Yes, the Holosun 508T X2 is waterproof, as well as shock-resistant and dustproof, suitable for various shooting environments.

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