The Holosun HS507K X2 Red Dot Sight (HS507K-X2) is a 1x open-reflex pistol red dot sight on the Holosun K (RMSc) footprint, with the Multi-Reticle System — a 2 MOA red dot, a 32 MOA circle, or both together as a circle-dot — behind a 0.58 × 0.77 in (14.7 × 19.6 mm) window.
It puts the full 507-series reticle set on a housing small enough for a slimline slide. The 32 MOA circle gives a fast close-range reference, the 2 MOA dot is the precise one, and switching between them is a button press. Shake Awake sleeps the reticle when the pistol is idle and wakes it on movement, X2 Lock Mode stops the settings being altered by accident, and the side-loading CR1632 tray is rated at up to 50,000 hours.
How It Compares
For a single uncluttered aiming point on the same footprint, the HS407K X2 red dot sight with the 6 MOA dot is the simpler option. The HS507K X2 with the ACSS Vulcan reticle swaps the Multi-Reticle System for a fixed chevron and ring. In green, see the HE507K X2 green dot sight; on a full-size slide, the HS507C X2 red dot sight carries the same reticle on the RMR footprint with Solar Failsafe. Browse all RMSc footprint red dot sights and the wider Holosun pistol red 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 the circle-dot option without a full-size optic on the slide
- Airsoft GBB compacts and training pistols used all year outdoors
Key Features
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Reticle: red Multi-Reticle System — selectable 2 MOA dot, 32 MOA circle, or circle-dot
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Window: 0.58 × 0.77 in (14.7 × 19.6 mm) viewing window
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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 memory
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Controls: X2 Lock Mode prevents accidental brightness and reticle changes
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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 windage and elevation, parallax-free
Technical Specifications
| Optic Type |
Open reflex pistol red dot sight, 1x (non-magnified) |
| Reticle |
Multi-Reticle System — 2 MOA dot / 32 MOA circle / circle-dot |
| Reticle Colour |
Red |
| Magnification |
1x, parallax-free |
| Window Size |
0.58 × 0.77 in (14.7 × 19.6 mm) |
| 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; X2 Lock Mode |
| Click Value |
1 MOA per click |
| Parallax |
Parallax-free |
| Eye Relief |
Unlimited (non-critical eye relief) |
| Housing |
Aluminium |
| MPN |
HS507K-X2 |
What's Included
- Holosun HS507K-X2 red 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
Is the Holosun HS507K X2 an RMR or an RMSc footprint optic?
The Holosun HS507K X2 Red Dot Sight uses the Holosun K footprint, which is the RMSc pattern, so it fits RMSc-cut slides and RMSc-pattern adapter plates. It is not an RMR-footprint optic; the RMR-footprint equivalent with the same reticle is the HS507C X2.
Will the Holosun HS507K X2 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 HS507K X2, so the sight fits that cut directly. Confirm your slide is the optics-ready RMSc variant before ordering.
What reticle options does the Holosun HS507K X2 have?
The Holosun HS507K X2 uses the Multi-Reticle System, which switches between a 2 MOA red dot on its own, a 32 MOA circle on its own, and both together as a circle-dot, all within a 0.58 × 0.77 in (14.7 × 19.6 mm) window.
Does the Holosun HS507K X2 have solar power?
No. The Holosun HS507K X2 runs from a CR1632 cell alone; Solar Failsafe is fitted to the larger C-series models such as the HS507C X2. Shake Awake motion activation is what supports the 50,000-hour runtime rating on the K-series.
What is X2 Lock Mode on the Holosun HS507K X2?
Lock Mode is an X2-generation feature that disables the buttons on the Holosun HS507K X2 once brightness and reticle are set, so the settings cannot be knocked out of position in a holster or a bag.
What battery does the Holosun HS507K X2 use and how is it changed?
The Holosun HS507K X2 uses one CR1632 cell in a side-loading tray, so the cell can be replaced with the optic still mounted and zeroed.
