Primary ArmsRed Dot Sight
Primary Arms SLx RS-10R Mini Reflex Red Dot Sight 3 MOA RMR Footprint
- Reticle
- 3 MOA red dot, daylight-bright with night-vision settings
- Footprint
- RMR and Holosun 407C/507C — the most widely supported optics-ready slide...
- Battery
- Side-loading CR1632, changed without unmounting the sight, so no re-zero
- Electronics
- AutoLive motion sensing, giving 25,000 to 50,000 hours of runtime
In stock — 7–10 business day delivery
Tracked delivery, estimated 7–10 working days
Want to know when it's back? Email us and we'll let you know
Multi-buy savings
Mix any optics and lights — applied automatically
- 5%2 items
- 10%3 items
- 15%4 or more
Applied automatically at checkout — no code needed. Accessories such as tailcaps, switches and mounts aren't included.
- Shipped from the UK with tracked delivery
- 30-day returns on unused items
- Warranty support — contact us first
Delivery
Every order is shipped from the UK with tracked delivery. Estimated delivery time is 7–10 working days, and you will receive tracking details by email as soon as your order is on its way.
Returns
Unused items in their original packaging can be returned within 30 days. Email info@opticstrader.co.uk first and we will confirm the return details.
Warranty
Every product is new and boxed. If anything goes wrong, contact us first and we'll help with a manufacturer warranty claim where one applies.
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. 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
- Reticle: 3 MOA red dot, daylight-bright with night-vision settings
- Footprint: RMR and Holosun 407C/507C — the most widely supported optics-ready slide cut
- Battery: Side-loading CR1632, changed without unmounting the sight, so no re-zero
- Electronics: AutoLive motion sensing, giving 25,000 to 50,000 hours of runtime
- Window: 23 × 19 mm, multi-coated
- Housing: 7075 aluminium, 1.1 oz (31 g)
- Mount: M1913 Picatinny rail mount supplied
| 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 |
| SKU / MPN / UPC | PA-SLX-RS-10R / 810045 / 818500019831 |
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.
Every order is shipped from the UK with tracked delivery, with an estimated delivery time of 7–10 working days. Unused items in their original packaging can be returned within 30 days for a full refund.