The Primary Arms SLx RS-10R Mini Reflex Red Dot Sight (part number 810045, SKU PA-SLX-RS-10R) is a mini reflex sight with a 3 MOA red dot on the RMR and Holosun 407C/507C footprint, with a 23 × 19 mm multi-coated window. It takes a side-loading CR1632 cell, uses AutoLive motion sensing for 25,000 to 50,000 hours of runtime, is daylight-bright with night-vision settings, weighs 1.1 oz (31 g) in a 7075 aluminium housing, and ships with an M1913 Picatinny rail mount.
The R in the name is the important part: this sight uses the RMR and Holosun 507C footprint, which is the most widely cut pattern on optics-ready slides and the most widely supported by mount makers. That means it fits far more guns and mounts than a proprietary pattern would, and it fits them without an adapter plate stacking extra height into the sight line.
The side-loading battery is the other practical detail. The CR1632 changes without unmounting the sight, so a battery swap never costs you your zero — which on a small optic is the difference between a five-minute job and a range session spent re-zeroing.
How It Compares
This is the value mini reflex sight with a plain 3 MOA dot. For the ACSS Vulcan reticle and a larger 26 × 20 mm window on the same RMR and 507C footprint, see the GLx RS-15R with the ACSS Vulcan reticle; for the ACSS Vulcan on the C-More and DPP footprint, the GLx RS-15. For a rifle-mounted micro dot instead, see the SLx MD-21 2 MOA 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 and Glock MOS fitting guide.
Ideal For
- Airsoft pistols and replicas taking an RMR-pattern optic cut
- Pistol shooting in Northern Ireland, where pistols are permitted
- Offset mounting on a rifle, as a close-range backup beside a magnified optic
- Practical shotgun and 3-Gun, where a light, low-profile sight suits a receiver mount
Key Features
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Reticle: 3 MOA red dot, daylight-bright with night-vision settings
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Footprint: RMR and Holosun 407C/507C — the most widely supported optics-ready slide cut
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Battery: Side-loading CR1632, changed without unmounting the sight, so no re-zero
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Electronics: AutoLive motion sensing, giving 25,000 to 50,000 hours of runtime
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Window: 23 × 19 mm, multi-coated
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Housing: 7075 aluminium, 1.1 oz (31 g)
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Mount: M1913 Picatinny rail mount supplied
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Warranty: Primary Arms Lifetime Warranty
Technical Specifications
| Product Type |
Mini reflex red dot sight |
| Magnification |
1x, unmagnified |
| Reticle |
3 MOA red dot |
| Illumination |
Daylight-bright, with night-vision settings |
| Window |
23 × 19 mm, multi-coated |
| Battery |
CR1632, side-loading; 25,000 to 50,000 hours with AutoLive |
| Footprint |
RMR / Holosun 407C-507C |
| Housing |
7075 aluminium |
| Weight |
1.1 oz (31 g) |
| Mount |
M1913 Picatinny rail mount included |
| Warranty |
Primary Arms Lifetime Warranty |
| SKU / MPN / UPC |
PA-SLX-RS-10R / 810045 / 818500019831 |
What's Included
- Primary Arms SLx RS-10R mini reflex red dot sight
- M1913 Picatinny mount
- CR1632 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
Which footprint does the Primary Arms SLx RS-10R use?
The Primary Arms SLx RS-10R uses the RMR and Holosun 407C/507C footprint, which is the most widely cut pattern on optics-ready slides and the most widely supported by mount manufacturers.
Can I change the battery without losing zero?
Yes. The CR1632 cell loads from the side of the SLx RS-10R, so the sight does not have to be removed from the slide or mount to change it, and the zero is retained.
What size is the dot on the SLx RS-10R?
The SLx RS-10R has a 3 MOA red dot, which covers approximately 3 inches at 100 yards and is a good general-purpose size, being quick to find up close while still precise enough at distance.
How long does the battery last?
The Primary Arms SLx RS-10R gives between 25,000 and 50,000 hours of runtime on a single CR1632 cell, helped by AutoLive motion sensing which shuts the dot down when the sight is still.
Does the SLx RS-10R come with a mount?
Yes. An M1913 Picatinny rail mount is supplied in the box, so the sight can be fitted to a rifle or shotgun rail as well as to an RMR-pattern slide cut.
How does the RS-10R differ from the original RS-10?
The R version moves to the RMR and Holosun 507C footprint, which gives considerably wider compatibility with optics-ready slides and aftermarket mounts than the original pattern.
