The Primary Arms GLx RS-15 Mini Reflex Red Dot Sight (part number 810038, SKU PA-GLX-RS-15TL-ACSS) is a competition-grade mini reflex sight with a large 26 × 20 mm window and the patented ACSS Vulcan reticle, on the C-More and DPP-style footprint, supplied with a Glock MOS mounting plate. It uses a top-loading CR2032 cell with AutoLive motion sensing, adjusts in 0.5 MOA clicks, offers 13 brightness settings of which 3 are night-vision compatible, and weighs 1.11 oz (31 g) in a 7075 aluminium housing with fully potted electronics.
The ACSS Vulcan reticle is genuinely unusual and worth understanding. When your presentation is correct you see only a crisp 3 MOA dot. When the sight drifts off your line — which is what happens on a rushed draw — a 250 MOA outer ring appears at the edge of the window, and which part of the ring you can see tells you exactly which way to correct. In practice it turns the optic into a coach: bad draws become visible instead of merely producing a miss, which is why it has a following among competitive shooters and in dry practice.
The top-loading battery is the other practical win, since the CR2032 changes without unmounting the sight and therefore without losing zero.
How It Compares
This is the ACSS Vulcan sight on the C-More and DPP footprint. If your slide or mount is cut for RMR or Holosun 507C — which most optics-ready pistols are — choose the GLx RS-15R with the ACSS Vulcan reticle instead, which is the same window, reticle and controls on the more common pattern. For a simpler and cheaper plain-dot sight on the RMR footprint, see the SLx RS-10R 3 MOA mini reflex red dot sight. Browse all pistol dot sights and offset red dot sights, and check compatibility with our pistol red dot footprint chart and Glock MOS fitting guide.
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 only when your presentation drifts, showing which way to correct
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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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Runtime: Over 25,000 hours dot-only, approximately 5,000 hours with the Vulcan ring, with AutoLive motion sensing
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Turrets: 0.5 MOA per click
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Footprint: C-More and DPP pattern, with a Glock MOS mounting plate included
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Housing: 7075 aluminium with fully potted electronics, 1.11 oz (31 g)
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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 selectable 250 MOA outer ring |
| Illumination |
13 brightness settings, 3 night-vision compatible |
| Window |
26 × 20 mm |
| Battery |
CR2032, top-loading, with AutoLive motion sensing |
| Battery Life |
Over 25,000 hours dot-only, approximately 5,000 hours with the Vulcan ring |
| Click Value |
0.5 MOA per click |
| Footprint |
C-More / DPP pattern, Glock MOS plate included |
| Housing |
7075 aluminium, fully potted electronics |
| Weight |
1.11 oz (31 g) |
| Warranty |
Primary Arms Lifetime Warranty |
| SKU / MPN / UPC |
PA-GLX-RS-15TL-ACSS / 810038 / 818500018858 |
What's Included
- Primary Arms GLx RS-15 mini reflex red dot sight
- Glock MOS mounting 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 pistols does the Primary Arms GLx RS-15 fit?
The GLx RS-15 uses a C-More and DPP-style footprint and is supplied with a Glock MOS mounting plate. For slides cut for the RMR or Holosun 507C pattern, the GLx RS-15R is the correct version.
Can I change the battery without losing zero?
Yes. The CR2032 cell loads from the top of the GLx RS-15, so the sight does not need to be removed from the slide or mount and the zero is retained.
How long does the battery last?
The Primary Arms GLx RS-15 runs for over 25,000 hours using the dot alone, and approximately 5,000 hours with the Vulcan ring active, assisted by AutoLive motion sensing.
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.
What size is the window on the GLx RS-15?
The GLx RS-15 has a 26 × 20 mm window, which is large for a mini reflex sight and makes the dot easier to find quickly on presentation.
