The Primary Arms GLx RS-15R Mini Reflex Red Dot Sight (SKU PA-GLX-RS-15R-ACSS, UPC 810178480203) is a mini reflex sight with a large 26 × 20 mm window and the patented ACSS Vulcan reticle, built on the RMR and Holosun 507C footprint and supplied with a Glock MOS adapter plate. It uses a top-loading CR2032 cell with AutoLive motion sensing, adjusts in 0.5 MOA clicks with 87 MOA of total windage and elevation travel, offers 13 brightness settings of which 3 are night-vision compatible, and is housed in anodised black 7075 aluminium with fully potted electronics.
The R is what makes this the version most people should buy. It takes everything from the RS-15 — the large window, the ACSS Vulcan reticle, the top-loading battery, the controls — and rebuilds it on the RMR and Holosun 507C footprint, which is the pattern the great majority of optics-ready slides and aftermarket mounts are cut for.
The ACSS Vulcan reticle itself is worth understanding. On target you see only a crisp 3 MOA dot. When your presentation drifts off line, a 250 MOA circle appears at the edge of the window, and the visible part of it tells you which way to correct. It makes a poor draw obvious rather than merely producing a miss, which is why it earns its place in dry practice as much as on the range.
How It Compares
This is the ACSS Vulcan sight on the common RMR and 507C footprint. If your slide or mount is cut for the C-More or DPP pattern instead, the GLx RS-15 with the ACSS Vulcan reticle is the matching version, with the same window, reticle and controls. For a simpler and cheaper plain-dot sight on the same RMR footprint, see the SLx RS-10R 3 MOA mini reflex red dot sight. Browse all pistol dot sights, RMR-footprint red dot sights and offset red dot sights, and check compatibility with our pistol red dot footprint chart, Glock MOS fitting guide and RMR versus RMSc comparison.
Ideal For
- Competition pistol shooting, where a consistent presentation is trained and scored
- Airsoft pistols and replicas, and dry practice where the ring exposes a poor draw
- Pistol shooting in Northern Ireland, where pistols are permitted
- Offset mounting on a rifle, as a fast close-range backup beside a magnified optic
Key Features
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Reticle: ACSS Vulcan — a 3 MOA dot with a 250 MOA outer correction ring that appears when your presentation drifts, showing which way to correct
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Footprint: RMR and Holosun 507C — the most widely cut optics-ready slide pattern — with a Glock MOS adapter plate included
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Window: Large 26 × 20 mm aperture
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Illumination: 13 brightness settings, 3 of them night-vision compatible
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Battery: Top-loading CR2032, changed without unmounting the sight, so no re-zero
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Electronics: AutoLive motion sensing, with fully potted circuitry
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Turrets: 0.5 MOA per click, 87 MOA of total windage and elevation travel
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Housing: 7075 aluminium, anodised black
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Warranty: Primary Arms Lifetime Warranty
Technical Specifications
| Product Type |
Mini reflex red dot sight |
| Magnification |
1x, unmagnified |
| Reticle |
ACSS Vulcan — 3 MOA dot with 250 MOA outer ring |
| Illumination |
13 brightness settings, 3 night-vision compatible |
| Window |
26 × 20 mm |
| Battery |
CR2032, top-loading, with AutoLive motion sensing |
| Click Value |
0.5 MOA per click |
| Adjustment Range |
87 MOA total windage and elevation |
| Footprint |
RMR / Holosun 507C, Glock MOS adapter plate included |
| Housing |
7075 aluminium, anodised black, fully potted electronics |
| Warranty |
Primary Arms Lifetime Warranty |
| SKU / MPN / UPC |
PA-GLX-RS-15R-ACSS / 610193 / 810178480203 |
What's Included
- Primary Arms GLx RS-15R mini reflex red dot sight
- Glock MOS adapter plate
- CR2032 battery, tools and manual
Warranty
Covered by the Primary Arms Lifetime Warranty.
UK Delivery & Support
This red dot sight is UK-stocked and dispatched tracked from our UK warehouse — no import duties and no customs delays — backed by UK-based aftersales support and the Primary Arms Lifetime Warranty.
Frequently Asked Questions
How does the ACSS Vulcan reticle work?
When the sight is correctly presented you see only the 3 MOA dot, and when your presentation drifts off line a 250 MOA outer ring appears at the edge of the window, with the visible portion of the ring showing which direction you need to correct.
Which footprint does the Primary Arms GLx RS-15R use?
The Primary Arms GLx RS-15R uses the RMR and Holosun 507C footprint, which is the most widely cut pattern on optics-ready slides, and a Glock MOS adapter plate is supplied in the box.
What is the difference between the RS-15 and the RS-15R?
The two sights share the same 26 by 20 mm window, ACSS Vulcan reticle and controls, but the RS-15R uses the far more common RMR and Holosun 507C footprint while the RS-15 uses the competition C-More and DPP pattern.
Can I change the battery without losing zero?
Yes. The CR2032 cell loads from the top of the GLx RS-15R, so the sight does not need to be removed from the slide or mount and the zero is retained.
How much adjustment does the GLx RS-15R have?
The GLx RS-15R adjusts in 0.5 MOA clicks and offers 87 MOA of total travel in both windage and elevation.
What does fully potted electronics mean?
Fully potted electronics are encapsulated in a solid compound inside the housing, which protects the circuitry from recoil shock, vibration and moisture ingress.
