Hey Freedom Gorillas, today we are going to cover the Holosun 507K X2 ACSS Vulcan. This is a co-branded open reflex micro pistol optic between Holosun and Primary Arms. It features the ACSS Vulcan reticle which is a large 230 MOA dotted outer ring and a 3 MOA center dot.
We understand that not having these optics in front of it can make it difficult to decide which to get. With this review article we aim to give you more information to help you make the right decision for your use case.
The red dot version is $329.99 and green dot version is $359.99.
Quick Nav
- TLDR
- Quick Stats
- Holosun 507K X2 ACSS Vulcan Reticles
- Holosun 507K X2 ACSS Vulcan Pricing & Models
- Holosun 507K X2 ACSS Vulcan Dimensions & Size
- Holosun 507K X2 ACSS Vulcan Footprint
- Holosun 507K X2 ACSS Vulcan Intended Use
- In the Holosun 507K X2 ACSS Vulcan Box
- Holosun 507K X2 ACSS Vulcan Screws & Batteries
- Holosun 507K X2 ACSS Vulcan Fitment Info & Adapter Plates
- Holosun 507K X2 ACSS Vulcan Review & Highlights
- Holosun 507K X2 ACSS Vulcan Downsides
- Holosun 507K X2 ACSS Vulcan Warranty
- Conclusion
TLDR
The Holosun 507K X2 ACSS Vulcan is the only “micro” pistol optic to have the ACSS Vulcan reticle. The ACSS Vulcan reticle helps you “find the dot” quicker and easier. It’s for beginners, advanced shooters, and competition shooters. It has 25k hours of battery life with the 230 dotted outer ring and center dot, and the reticle can be toggled to just the 3 MOA center dot only by holding down the “-” button for 3 seconds. This gives you 50k Hours of battery life. The housing is 7075 T6 aluminum, and the footprint is a modified RMSc.
| Buy the 507K X2 ACSS Vulcan Red Dot at The Best Price | Buy the 507K X2 ACSS Vulcan Green Dot at The Best Price |
Other quick stats and dimensions on the Holosun 507K X2 ACSS Vulcan are as follows:
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Holosun 507K X2 ACSS Vulcan Reticles
The 507K ACSS vulcan comes in red or green reticle versions. It features a 230 MOA dotted outer ring, and a 3 MOA center dot. The outer ring can be toggled on or off by hodling down the “-” button for 3 seconds.
In real life when viewing the dot directly in the center, most of the outer ring is not visible. The outer ring is more visible when you are “off center”. The ACSS Vulcan reticle is made to help you “find the dot” faster. The outer ring acts as a reference point so you can quickly adjust your aim. You can learn more about the ACSS Vulcan reticle here in our guide.
The ACSS Vulcan reticle isn’t just for newbies, advanced and competition shooters use it because they find it helpful especially during scenarios when you are using your non dominant hand, or are shooting from abnormal positions such as laying on your side or peeking around a corner.
Holosun 507K X2 ACSS Vulcan Pricing & Models
The Holosoun 507K X2 ACSS Vulcan comes in red or green reticles. The green version is slightly more expensive.
You can learn more about red vs green dots here.
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$329.99 
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$359.99 
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Holosun 507K X2 ACSS Vulcan Dimensions & Size
- Deck height: 7MM
- Width: .98"
- Length: 1.6"
- Height: .95"
- Window Size: .77" Wide, .58" Tall
- Weight: 1oz
Holosun 507K X2 ACSS Vulcan Footprint
The Holosun 507K X2 ACSS Vulcan has a modified RMSc footprint a.k.a. K Series footprint. This is similar to an RMSc footprint but it doesn't have rear recoil lugs. Learn more about RMSc vs K Series footprints here. The rear recoil lugs were removed to allow Holosun to seal the unit making it IP67 waterproof rated which makes it one of the best waterproof rated optics in this category. To fit it on your RMSc footprint pistol you will need an adapter plate which can be found below in our fitment table.
Holosun 507K X2 ACSS Vulcan Intended Use
The 507K X2 ACSS Vulcan is a micro pistol optic which means it is on the smaller size. It’s intended to be used on smaller pistols like the Glock 43X MOS, S&W Shield Plus, or Springfield Hellcat OSP. It can still be used on larger pistols like a Glock 19 MOS and S&W M&P 2.0, however to mount this on any pistol you must be aware of your pistols optic footprint. View the fitment info guide below to see how it can fit on your pistol.
The 507K X2 ACSS Vulcan can also be used a rifle optic, PCC optic, or backup scope optic if you get a "K Series" picatinny or offset adapters found here.
In the Holosun 507K X2 ACSS Vulcan Box
When you open the 507K X2 ACSS Vulcan this is what you will find in the box:
- 1x CR1632 Battery (installed inside the optic)
- Holosun Warranty Card
- Holosun Battery, Screw, & Adjustment Tool,
- Holosun Manual
- Primary Arms Manual
- M3 Screws, M4 Screws
- 507K X2 ACSS Vulcan Optic
- Lens Cloth
Holosun 507K X2 ACSS Vulcan Screws & Batteries
Here is an up close photo of the 507K X2 ACSS Vulcan Screws, Battery, and Tool that come in the box. The battery will be pre-installed in the optic.
Holosun 507K X2 ACSS Vulcan Fitment Info & Adapter Plates
Below is information on mounting the Holosun 507K X2 ACSS Vulcan Optic on different pistols. Some pistols require adapter plates to make it fit. The table below is for Optics Ready pistols only. If you do not have an optics ready pistol and still want to mount a 507K X2 ACSS Vulcan to your platform, you can get a dovetail mount which replaces your rear dovetail sights. Find all our dovetail mounts here.
*Note: Clicking on the pistol name below will take your to our fitment guide which explains more about each platform.
Don't see your model listed? Check out our Fitment Guides Here.
Holosun 507K X2 ACSS Vulcan Review & Highlights
The 507K X2 ACSS Vulcan is a great micro pistol optic. It is the only micro pistol optic to feature the popular ACSS Vulcan reticle. To learn more about the ACSS Vulcan reticle read our guide here.
If you are new to the pistol red dot shooting game, then one of the first things you will realize is that “finding the dot” is something you will need to practice. Many first time users will install a pistol red dot, bring it up to aim, and aren’t able to see the dot. With practice you will improve, however the ACSS Vulcan helps tremendously in this scenario because it features a large 230 MOA dotted outer ring.
This outer ring is mainly visible when you do not have the dot centered. You will quickly learn how to adjust your grip when you see where the large outer ring is when you draw the weapon. This acts like an “aim assist” for your red dot.
As mentioned above, this helps with beginners, but it also comes in handy for competitive shooting or stressful scenarios where you may not be in a perfect shooting position, or shooting at weird angles.
The 507K X2 ACSS Vulcan is very popular amongst certain groups of people who really value the added benefits of running the ACSS Vulcan.
Overall we really like it and think the larger outer ring certainly helps find the dot, especially on the smaller window of the 507K X2 ACSS Vulcan optic. The smaller the window, the more difficult finding the dot can be.
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Holosun 507K X2 ACSS Vulcan Downsides
The only real downside to the 507K X2 ACSS Vulcan is that they are a modified RMSc footprint. Which means for some guns you will need an adapter plate. For example the Springfield Hellcat and Glock 43x MOS. This will cause the optic to sit a bit higher and will obstruct your irons sights.
This can be fixed with getting taller iron sights, but it is something worth noting.
If this is a deal breaker for you you can check out the Vortex Defender. It doesn’t have the same reticle, but it will mount directly on a regular “RMSC” footprint slide if that is a top priority for you.
Holosun 507K X2 ACSS Vulcan Warranty
Since the Holosun 507K X2 ACSS Vulcan is a co-branded optic with Primary Arms, it actually falls under the Primary Arms warranty.
Primary Arms has a lifetime warranty on all their optics. So if you have any issues at all you can contact Primary Arms and they will fix it.
Also when you purchase from Freedom Gorilla, if you have an issue within 30 days we will replace the optic for you free of charge.
Conclusion
The 507K X2 ACSS Vulcan is in a league of it’s own. If you like the idea of the ACSS Vulcan reticle, and want it on a micro compact pistol or any pistol with an RMSc or Modified RMSc footprint, then this is the only game in town.
Most who purchase this optic are very happy with it, and many run nothing but the ACSS Vulcan reticle on all their pistols.
If you have any further questions please reach out.
Thanks for reading!