The Holosun HS507K X2 with the patented ACSS Vulcan reticle is a compact open-emitter pistol red dot for subcompact and slimline pistols. The ACSS Vulcan pairs a precise red chevron aiming point with a large outer reference circle, guiding your eye back on target fast for rapid reacquisition.
On the Holosun K (RMSc) footprint, it carries low and light (1.0 oz), with Shake Awake and last-setting recall, a side-loading CR1632 (up to 50,000 hours), and a rugged IP67 aluminium housing rated to 5000G.
How It Compares
Prefer the green ACSS version? See the HE507K X2 ACSS (green). Want a simple dot instead of ACSS? The HS407K (6 MOA red). Browse all Holosun pistol dots and RMSc-footprint optics; learn the reticle in our ACSS guide and see the best pistol red dots.
Ideal For
- Concealed carry and subcompact pistols
- Slimline handgun platforms
- Shooters wanting fast ACSS reacquisition
Key Features
- ACSS Vulcan reticle (red chevron + circle)
- RMSc / Holosun K footprint; 1.0 oz
- Shake Awake with last-setting recall
- Up to 50,000 h on side-loading CR1632
- IP67, 5000G-rated aluminium housing
Technical Specifications
| Reticle |
ACSS Vulcan (red chevron) |
| Magnification |
1x |
| Footprint |
Holosun K (RMSc) |
| Battery |
CR1632 — up to 50,000 h |
| Brightness |
12 (10 day / 2 NV) |
| Adjustment |
1 MOA/click, ±30 MOA, parallax-free |
| Dimensions / Weight |
1.6 × 0.98 × 0.95 in / 1.0 oz |
| Waterproof |
IP67 |
What's Included
- Holosun HS507K X2 red dot sight
- CR1632 battery, adjustment tool, mounting hardware, manual
UK Delivery & Support
UK-stocked and dispatched tracked from our UK warehouse — no import duties or customs delays — backed by UK-based support and Holosun's limited lifetime warranty.
Frequently Asked Questions
What is the ACSS Vulcan reticle?
A chevron inside a large ring — the ring pulls your eye to centre for speed, the chevron tip gives a precise aiming point.
What footprint is it?
The Holosun K (RMSc) footprint for micro-compact optics-ready slides.
Red or green ACSS?
This is the red version; the HE507K X2 ACSS is the green equivalent.
