Holosun 507c vs 507k Testing and Insights for 2025
The Holosun 507C vs 507K-GR X2 are two compact and reliable red dot sights designed to enhance shooting performance with advanced features and exceptional durability.
Both models offer unique benefits, making them a solid choice for shooters who prioritize precision and reliability.
If you’re looking for a red dot sight for your subcompact pistol or full-sized firearm, these models provide excellent performance across different applications.
Key Specifications
Reticle Options
Both sights feature Holosun’s Multi-Reticle System (MRS). The 507C allows users to choose between a 2 MOA dot, a 32 MOA circle, or a combination of both, offering versatility for various shooting scenarios.
Similarly, the 507K-GR X2 offers the same reticle options with a green dot, providing excellent visibility and faster target acquisition, especially in bright conditions.
Battery Life
The 507K-GR X2 impresses with its 50,000-hour battery life using a CR1632 battery, offering a long-lasting power source even on a medium brightness setting.
The 507C also has a similarly impressive battery life, ensuring extended use in the field, making both models reliable during long shooting sessions without frequent battery changes.
Construction
Both optics are built with durable 7075 T6 aluminum, offering lightweight yet rugged construction.
The 507C is larger in size, making it suitable for full-sized pistols, rifles, and shotguns, while the 507K-GR X2 has a more compact design tailored for subcompact pistols, offering a balance of durability and portability.
Brightness Settings
Both models come equipped with 10 daylight brightness levels and 2 night vision-compatible settings, allowing users to fine-tune their reticle for optimal visibility in any environment.
The 507K-GR X2 offers a bright green reticle, which stands out in various lighting conditions, while the 507C provides a red reticle that is equally versatile.
Shake Awake Technology
A standout feature of both optics is the Shake Awake technology, which deactivates the LED when idle and instantly reactivates it with minimal motion.
Additionally, the 507K-GR X2 includes a convenient side-mounted battery tray, allowing users to replace the battery without removing the optic, avoiding the need to re-zero.
Holosun 507c vs 507k
Highlights
- Multi-Reticle Options
- Shake Awake Technology
- Side-Mounted Battery Tray
- Durable Aluminum Construction
- Long Battery Life
The 507C, designed for full-sized firearms, boasts a larger window for faster target acquisition, making it ideal for those who prioritize a larger field of view and versatility across various weapons like pistols, rifles, and shotguns.
It also includes a solar backup feature to keep the optic running even if the battery dies, ensuring reliability in extended-use scenarios.
On the other hand, the 507K-GR X2 is a more compact option tailored for subcompact pistols, offering a sleek design without sacrificing performance.
The small window size might be limiting for some shooters accustomed to larger optics, but it strikes the perfect balance between portability and sight clarity.
The green reticle of the 507K-GR X2 stands out more in certain conditions, making it a fantastic option for those seeking high visibility and precision in a compact package.
Helpful Review
As a long-time user of Holosun optics, I’ve the pleasure of testing both the 507C ACSS Vulcan X2 and the 507K-GR X2, and each has impressed me in different ways.
The 507C ACSS Vulcan X2 quickly became one of my favorite optics, even surpassing my previously preferred Delta Point Pro.
The design is functional and aesthetically pleasing, with standout features that enhance the overall experience.
The ACSS Vulcan reticle greatly improves target acquisition, and the auto-adjust mode adapts to changing light conditions, making it very user-friendly.
The tactile and audible feedback from the buttons is a big plus, and I really appreciate the included compact tool for adjustments, which reflects Holosun’s attention to detail.
However, there are some minor drawbacks. It doesn’t come with a base plate for mounting, so I had to research and purchase the correct one separately.
The screws provided didn’t match my firearm’s slide threading, but this wasn’t too big of an issue as I was able to use the original screws.
Additionally, the pre-installed battery’s lifespan remains unclear, and a protective cover must be purchased separately.
Despite these minor inconveniences, I trust this optic and consider it a game-changer in terms of performance and reliability.
If you’re planning to mount it, make sure to verify the base plate compatibility with your setup.
The 507K-GR X2 has also exceeded my expectations. The solid, durable frame inspires confidence, and I believe it could withstand rough handling without issue.
One feature I really love is the side-mounted battery tray, which allows me to replace the battery without removing the optic and re-zeroing, a huge convenience.
The 50,000-hour battery life is impressive, and the Shake Awake technology ensures the optic is always ready to go when I need it.
The 2 MOA dot offers precision, though I’m still undecided about the 32 MOA reticle, which is useful for quick target acquisition.
The brightness settings are great, with a wide range from extremely dim to very bright, but the brightest setting can be a bit too intense in direct sunlight, and the dimmest is nearly invisible.
There’s still plenty of flexibility to find the perfect setting for various environments. After using it for several months, I can confidently say it’s a reliable, versatile, and high-quality red dot.
I was so impressed that I bought a second one for my wife, who switched from iron sights to the 507K-GR X2, and she’s just as happy with it.
Conclusion
Both optics have their merits. The 507C ACSS Vulcan X2 excels in tactical features with its ACSS reticle, offering quicker target acquisition and precise adjustments.
However, its lack of a mounting base plate and the need to purchase a protective cover are minor inconveniences.
On the other hand, the 507K-GR X2 stands out for its compactness, durability, and convenience.
The side-mounted battery tray and Shake Awake technology make it more user-friendly, and its performance is consistent.
I find the 507K-GR X2 to be an all-around excellent choice for reliability, versatility, and ease of use, especially for those who prioritize convenience and durability in a smaller form factor.
If you’re looking for a red dot optic with advanced features and a unique reticle for tactical purposes, the 507C ACSS Vulcan X2 would be a great choice.
However, for everyday use, reliability, and ease of maintenance, I highly recommend the 507K-GR X2.
It’s become my go-to optic, and I’m confident it will serve you well, whether on the range or in a tactical scenario.
