The Primary Arms SLx RS-10R is the value pistol red dot sight done properly — a crisp 3 MOA dot on the universal RMR/Holosun 507C footprint, so it drops onto more optics-ready slides and mounts than almost anything else at the price.
The side-loading CR1632 swaps without unmounting, and AutoLive motion sensing pushes runtime to 25,000–50,000 hours. Multi-coated 23x19mm lens, daylight-bright with night-vision settings, 7075 aluminium at just 1.1 oz — with a Picatinny rail mount in the box.
How It Compares
Bigger window and the Vulcan reticle? The GLx RS-15. Enclosed emitter? The PLx HTX-1. Browse RMR-footprint red dots and all pistol dot sights; see best budget red dots.
Key Features
- 3 MOA red dot; daylight bright + NV settings
- RMR / Holosun 507C footprint
- Side-load CR1632 — no re-zero on swaps
- AutoLive — 25,000–50,000 h runtime
- 7075 aluminium, 1.1 oz; Picatinny mount included
Technical Specifications
| Reticle |
3 MOA red dot |
| Window |
23 x 19mm multi-coated |
| Battery |
CR1632 side-load; AutoLive, 25,001–50,000 h |
| Footprint |
RMR / Holosun 407C-507C |
| Weight |
1.1 oz — 7075 aluminium |
| SKU / MPN / UPC |
PA-SLX-RS-10R / 810045 / 818500019831 |
What's Included
- SLx RS-10R sight, M1913 Picatinny mount, CR1632, tools, manual
UK Delivery & Support
UK-stocked and dispatched tracked from our UK warehouse — no import duties or customs delays — backed by UK-based support and Primary Arms' lifetime warranty.
Frequently Asked Questions
Will it fit my RMR-cut slide?
Yes — it shares the RMR/507C footprint used by Glock MOS (with the factory RMR plate), Walther PDP and most full-size optics-ready pistols. Check our footprint chart.
How is it different from the original RS-10?
The R model moves to the RMR/507C footprint for far wider slide and mount compatibility.
