The Holosun HE507K X2 Green Dot Sight with the ACSS Vulcan reticle (HE507K-GR-X2-ACSS) is a 1x open-reflex pistol green dot sight on the Holosun K (RMSc) footprint, with a fixed green chevron aiming point inside a large guidance circle, in a housing measuring 1.6 × 0.98 × 0.95 in (40.6 × 24.9 × 24.1 mm) and weighing 1.0 oz (28 g).
It combines the two things shooters most often ask for on a small pistol optic: the ACSS Vulcan's fast guidance circle and fine chevron tip, and a green emitter that the eye reads more brightly than red at the same output. Shake Awake with last-setting recall keeps it ready without draining the cell, and the aluminium housing is rated IP67 and tested to 5000G of vibration.
How It Compares
The red version is the HS507K X2 with the ACSS Vulcan reticle. For a switchable circle-dot in green on the same footprint, the HE507K X2 green dot sight uses the Multi-Reticle System, and the HE407K X2 green dot sight is the plain 2 MOA option. On a full-size slide, the HE507C X2 with the ACSS Vulcan reticle is the RMR-footprint equivalent with Solar Failsafe. Browse all RMSc footprint red dot sights and the full Holosun green dot sight range.
Ideal For
- Slimline and subcompact pistols with an RMSc-cut slide
- Section 1 long-barrelled pistols and revolvers held on a UK firearm certificate
- Shooters who want ACSS reacquisition speed with a green reticle on a small optic
- Airsoft GBB compacts and range training pistols
Key Features
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Reticle: ACSS Vulcan — green chevron aiming point inside a large guidance circle
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Footprint: Holosun K (RMSc) footprint, for RMSc-cut slides and RMSc-pattern plates
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Illumination: 12 brightness settings — 10 daylight and 2 night-vision compatible
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Electronics: Shake Awake motion activation with last-setting recall
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Battery: side-loading CR1632 tray, up to 50,000 hours of runtime
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Adjustment: 1 MOA per click, ±30 MOA windage and elevation, parallax-free
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Size: 1.6 × 0.98 × 0.95 in (40.6 × 24.9 × 24.1 mm), 1.0 oz (28 g)
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Housing: aluminium, IP67 rated and tested to 5000G
Technical Specifications
| Optic Type |
Open reflex pistol green dot sight, 1x (non-magnified) |
| Reticle |
ACSS Vulcan — chevron inside a guidance circle |
| Reticle Colour |
Green |
| Magnification |
1x, parallax-free |
| Footprint |
Holosun K footprint (RMSc pattern) |
| Illumination |
12 brightness settings — 10 daylight / 2 night-vision compatible |
| Battery |
CR1632 in a side-loading tray, up to 50,000 hours |
| Power Management |
Shake Awake motion activation with last-setting recall |
| Click Value |
1 MOA per click |
| Adjustment Range |
±30 MOA windage and elevation |
| Parallax |
Parallax-free |
| Dimensions |
1.6 × 0.98 × 0.95 in (40.6 × 24.9 × 24.1 mm) |
| Weight |
1.0 oz (28 g) |
| Housing |
Aluminium |
| Water Resistance |
IP67 water and dust resistant |
| Vibration Rating |
5000G |
| MPN |
HE507K-GR-X2-ACSS |
What's Included
- Holosun HE507K-GR-X2-ACSS green dot sight
- Multi-tool, lens cloth and user manual
Warranty
Covered by Holosun's manufacturer warranty, handled in the UK by Xtreme Tactical.
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 warranty.
Frequently Asked Questions
What is the ACSS Vulcan reticle on the Holosun HE507K X2?
The ACSS Vulcan is a Primary Arms reticle combining a chevron aiming point with a large surrounding guidance circle. On the Holosun HE507K X2 ACSS the circle draws the eye to centre for fast reacquisition, while the chevron tip gives a finer aiming reference than a round dot.
Is the Holosun HE507K X2 ACSS an RMR or an RMSc footprint optic?
The Holosun HE507K X2 ACSS uses the Holosun K footprint, which is the RMSc pattern, so it fits RMSc-cut slides and RMSc-pattern adapter plates. The RMR-footprint version of the same reticle is the HE507C X2 ACSS.
Will the Holosun HE507K X2 ACSS fit a SIG P365 or a Glock 43X?
Both of those pistols use the RMSc optic cut, which matches the Holosun K footprint on the HE507K X2 ACSS, so the sight fits that cut directly. Check that your slide is the optics-ready RMSc variant before ordering.
Does the Holosun HE507K X2 ACSS have solar power?
No. The Holosun HE507K X2 ACSS runs from a CR1632 cell alone, with Shake Awake and last-setting recall supporting the 50,000-hour runtime rating. Solar Failsafe is a feature of the larger C-series models such as the HE507C X2 ACSS.
How much does the Holosun HE507K X2 ACSS weigh?
The Holosun HE507K X2 ACSS weighs 1.0 oz (28 g) and measures 1.6 × 0.98 × 0.95 in (40.6 × 24.9 × 24.1 mm), so it adds very little to a slimline slide.
Is the Holosun HE507K X2 ACSS waterproof?
The Holosun HE507K X2 ACSS is rated IP67, which covers full dust protection and immersion in water, and it is tested to 5000G of vibration.
