The Primary Arms SLx 3X MicroPrism in Flat Dark Earth does something a red dot can't: because its ACSS Raptor reticle is etched into the glass, it stays crisp and fully usable even with the illumination off — a favourite for shooters with astigmatism, who often see red dots as a smear. The coyote finish matches FDE builds.
At under 8 oz and under 3 inches, this fixed-3x prism adds real magnification and a ballistic reticle without the bulk of an LPVO. The ACSS Raptor 5.56/.308 Yard reticle (red illuminated) packs bullet-drop holdovers, ranging, wind holds and a precise centre chevron.
How It Compares
Prefer black, or green illumination? See the 3X MicroPrism red (black) or green. Want more magnification? The SLx 5X MicroPrism. Browse all prism scopes and AR-15 optics; read our ACSS explainer.
Ideal For
- Compact 5.56/.308 rifle builds
- FDE/tan rifle setups
- Mid-range shooting
- Shooters with astigmatism (etched reticle)
Key Features
- Fixed 3x; etched red ACSS Raptor 5.56/.308 Yard reticle
- FDE finish; usable with illumination off (astigmatism-friendly)
- 13 settings (3 NV); AutoLive; up to ~29,000 h
- Wide 38 ft FOV at 100 yds; 1/4 MOA clicks
- Ruggedised mount with 8 height options; mini-prism footprint
Technical Specifications
| Magnification |
3x (fixed) |
| Reticle |
ACSS Raptor 5.56/.308 Yard (etched, red) |
| Brightness |
13 settings (3 NV) |
| Click Value |
1/4 MOA |
| Adjustment Range |
80 MOA W&E |
| FOV @ 100 yd |
38 ft |
| Eye Relief |
2.7 in |
| Battery |
CR2032 (up to ~29,000 h) |
| Length / Weight |
2.95 in / under 8 oz |
| Finish |
Flat Dark Earth |
| Warranty |
Primary Arms Lifetime |
What's Included
- Primary Arms SLx 3X MicroPrism scope (FDE)
- CR2032 battery, lens covers, ruggedised mount (8 heights), 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 the Primary Arms Lifetime Warranty.
Frequently Asked Questions
Same as the black version?
Yes — identical optic, finished in Flat Dark Earth.
Why a prism over a red dot?
The etched reticle stays sharp even without illumination — ideal for astigmatism.
How does it mount?
On the industry-standard mini-prism footprint, with 8 included height options.
