HOLOSUN 507K ACSS® Vulcan™ Dot Reticle

8 customer reviews



Made as a collaboration between Holosun Optics and Primary Arms Optics, the illuminated HS507K-X2 with ACSS® Vulcan® Dot Reticle brings the revolutionary 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 illuminated brightness settings and intuitive push-button controls, the HS507K-X2-ACSS works in any lighting condition and is even compatible with night vision devices.


  • Illuminated ACSS® Vulcan® Dot Reticle System
  • Ultra-compact size for concealed carry applications.
  • Two Reticle Settings: Dot + Circle, and Dot only
  • Shake Awake™ – Motion on with last setting recall.
  • Parallax-free, unlimited eye relief.
  • CNC milled 7075 Aluminum Housing.
  • 10 daylight and 2 night vision compatible brightness settings.
  • IP67 Certified.

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. ACSS Vulcan Dot alleviates one of the main weaknesses of micro reflex optics, ensuring you can always find your reticle aiming point, despite the smaller optical aperture.

This version of the optic uses reticle illumination. illumination is better for low-light and nighttime as it preserves your natural night vision. also contrasts more against many natural backgrounds, such as dense foliage. For GREEN illumination, the HE507K-GR-X2-ACSS offers the same features but with a green LED emitter.

The HS507K-X2 with ACSS Vulcan Dot Reticle features an modified RMSc footprint and is natively compatible with many of the most popular concealed carry pistols.


Additional information

Weight 0.375 lbs

Red, Green

Based on 8 reviews
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  1. dustinwilliams60 (verified owner)

    Love the new 507K ACSS. Tacrig always super fast shipping and the best customer service. I do like the new reticle with the dot. I would recommend this to anyone at any level.

  2. Brandon Williams (verified owner)

    Was a little hesitant to order the Vulcan 507k because I could not find any where else that sold them. I am glad I did! I bought this red dot for a Springfield hellcat, and the combo works great. I like the Vulcan reticle because it makes finding the dot way easier and faster. Quality is great along with durability.

  3. Dale Larson (verified owner)

    I’ve tried nearly a dozen red dots, with half a dozen currently in use on pistols. My favorite has been 6 MOA dot, but this one is at least tied, if not taking the lead. The ACSS reticle is awesome. Especially for someone fairly new to reddots or anyone still struggling to get 100% consistent presentation always seeing that dot pop up immediately. But especially on a carry optic, where stress may be at the max, and where odd shooting positions may create a new situation, this is ideal as a way to bulletproof getting on target faster when the situation is anything but ideal. And TacRig was an awesome place to order from with great service and great shipping. This was my first order from them, and I will definitely order from them again. Thanks!

  4. Reviewing Reviewer (verified owner)

    Excellent service from TACRIG! Answered my email questions quickly and shipping was super fast. A+++

  5. Daniel (verified owner)

    came with a battery already installed which was a little weird but whatever it looked brand spankin new. so far so good

  6. Todd Clifford (verified owner)

    I ordered one of these because I wanted the shake awake feature and the circle dot for my PSA 5.7×28 ROCK pistol! the combo is great! fast acquisition and accurate! A+

  7. Jade (verified owner)

    Everything about this purchase was amazing, great product, great customer service, fast shipping.
    Nice to have such a good online purchase experience.

  8. machismo989 (verified owner)

    Excellent site and came cross country super quick!

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