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Your cart is empty.Made as a collaboration between Holosun Optics and Primary Arms Optics, the red-illuminated HS507K-X2 with ACSS Vulcan Dot Reticle brings the Vulcan aiming system to a micro reflex footprint. Designed for concealed carry, the HS507K-X2-ACSS is lightweight, durable, and dependable, with up to a 40,000-hour runtime on medium settings. This sight retains all the core features and technologies of the standard Holosun model, including the Multi-Reticle System, Shake Awake technology, and a built-in Lock Mode. With 12 red-illuminated brightness settings and intuitive push-button controls, the HS507K-X2-ACSS works in any lighting condition. This co-branded optic features the ACSS Vulcan Dot reticle system, which improves acquisition and recovery speed through its patented outer reference circle. When aimed on-target, the ACSS Vulcan Dot reticle appears as a simple, unobtrusive 3 MOA dot. When your aim is off target, the edge of the 230 MOA outer circle guides you back to center. The HS507K-X2 with ACSS Vulcan Dot Reticle features an RMSc footprint. NOTE: Astigmatism can cause a red dot reticle to look blurry/fuzzy. This is a very common eye condition many have but are unaware of. A quick at home check is to take a picture of the reticle with your phone’s camera as your phone cannot have an astigmatism. Another issue can be from having the brightness setting up too high in a bad lighting environment like indoors. Try turning the brightness down and repeating the previous suggestion if the reticle is still blurry to your eyes. If the reticle is still blurry in both pictures, there may be an issue with the reticle that is covered by warranty. EXPORT CONTROLLED ITEMS: These items are controlled for export and may require an export license from the U.S. Government. Buyer acknowledges that Buyer is responsible for obtaining all export licensing authorizations and filing all export documents prior to export from the United States.
Vince R.
Wednesday, July 30, 2025
Love the Vulcan ACSS reticle on these sites. It’s all I use. The RMSc foot print mounts directly to my SIG P365xl and I have 1 on my 40 cal S&W shield, which I converted to optic ready with a plate that mounts in the rear site dove tail. Love these sites. Also have the larger 507c on my HK VP9, also a Vulcan ACSS dot.
Customer CXIII
Saturday, July 26, 2025
Running it on an off duty csxe. The Vulcan does help your brain auto focus the dot into your eye sight. Not as needed if you actually practice a ton but if you don’t shoot often and or if you shoot from a variety of positions and not statically it really is super useful. Glass is clear with no noticeable tint and housing seems sturdy. Gets banged up a little here and there and so far no issue. Too new to comment on battery life but a fantastic product all around.
Grey Day
Sunday, July 20, 2025
I bought two of these to install on Glock43x and Sig P365 380. I mounted sights using screws provided and took guns to range to put first rounds thru. Both guns had stovepipes and jammed. The Sig malfunction every couple rounds. I am a Sig and Glock armorer so after trying some standard things - the only thing these two guns had in common was Sight. I remember screws causing problems with FTF's and extractor issues- I removed the right side (extractor side) screw on each gun and filed down about 1/16 or so. Re- loctite and headed to range- no malfunctions either gun- full mags; partial mags, 200 rnds each gun. Hope this might help others if you have problems like this... Primary arms need to check screw specs.... Love this sight!
JustMe
Tuesday, June 17, 2025
I always seem to loose the red dot when I'm shooting (because I don't practice enough). The set up with giant ring surrounding the red dot makes it super easy locate the dot. Keeps it's center with easy to replace battery.
Andrew
Friday, June 13, 2025
This is a great upgrade for those that are using this size RDS. The smaller window can make it harder to initially find the dot when doing a quick draw or reload.I have been waiting for Holosun to make this Vulcan version in the 507K size and they finally delivered! The outer ring is not a solid ring, so it doesn't look as neat as it does on the larger version, but I have read the dotted outer ring helps save on batter life. So far, I find it works great as advertised. I also am glad they went with the dot instead of the center inverted-v. Perfect for my smaller everyday CCW.EDIT: this listing says it's a 1 MOA dot, but it's really a 3 MOA dot with a 230 MOA outer ring. Those specs are printed in the instruction manual inside the box.
pfh
Wednesday, June 4, 2025
With a lot of training should be able to draw and consistently put pistol on target without the assistance of the outer circle. That said, this system makes it foolproof
Shelly Vorrath
Saturday, May 17, 2025
I took my Glock 43X in to have this Holosun red dot put on. But I was told by the gunsmith that apparently Holosun had upgraded this red dot and failed to mention this to Glock owners. I'm going to contact Holosun about this, but because this was an unexpected cost and delay, I'm giving it a low rating.
Tres
Thursday, January 9, 2025
Installed the plate, installed the sight and got it zero with no issues. Shake awake is nice and the MOA ring will guide you to the dot immediately. See how it holds up over time. G19 G5 MOS
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