The Primary Arms SLx 3X MicroPrism Scope in Flat Dark Earth (part number 710054, SKU PA-SLX-3XMP-RAPTOR-5YP-FDE) is a fixed 3x magnification prism scope with a glass-etched ACSS Raptor 5.56/.308 Yard reticle in red, finished in Flat Dark Earth. It is 2.95 in (75 mm) long, weighs under 8 oz (227 g), adjusts in 1/4 MOA clicks with 80 MOA of windage and elevation travel, gives a 38 ft field of view at 100 yards (12.7 m at 100 m), and runs up to around 29,000 hours on a CR2032 cell across 13 brightness settings, three of them night-vision compatible.
Optically this is the same scope as the black 3X; the difference is the coyote finish, which matches tan handguards and stocks. What it shares with the rest of the MicroPrism line is the thing that matters most to a particular group of shooters: the reticle is etched into the glass rather than projected as an LED, so an eye with astigmatism resolves it sharply instead of seeing the smear or starburst that makes red dots frustrating for so many people.
How It Compares
This is the Flat Dark Earth 3X with red illumination. The same optic is offered in black with red ACSS Raptor illumination or green ACSS Raptor illumination. For more magnification and a milliradian grid, see the SLx 5X MicroPrism with the ACSS Aurora MIL reticle; for an unmagnified prism with a wider window, the GLx 1X MicroPrism with the ACSS Cyclops reticle. It also pairs well with a Flat Dark Earth LPVO such as the SLx 1-6x24 Gen IV in Flat Dark Earth. Browse the Primary Arms prism scope range and all prism scopes, and read our guides to how prism scopes work and astigmatism and red dot sights.
Ideal For
- Shooters with astigmatism who see red dots as a smear, flare or double image
- Civilian Service Rifle and practical rifle builds finished in tan or coyote
- Straight-pull AR-platform rifles in Great Britain wanting magnification without an LPVO's bulk
- Deer stalking and vermin control over dry grass, where FDE is less conspicuous than black
Key Features
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Magnification: Fixed 3x — real magnification in a body under 3 inches long
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Reticle: ACSS Raptor 5.56/.308 Yard, etched into the glass, with bullet drop holdovers, ranging, wind holds and a precise centre chevron, calibrated for 5.56 and .308 in yards
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Astigmatism: The etched reticle is resolved through the optic's own focusing system, so it stays sharp for eyes that see LED red dots as a smear
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Illumination: Red, 13 settings of which 3 are night-vision compatible, with AutoLive motion sensing, up to around 29,000 hours on one CR2032 cell
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Backup: Fully usable with illumination off or the battery flat
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Field of view: 38 ft at 100 yards (12.7 m at 100 m)
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Turrets: 1/4 MOA per click, 80 MOA of windage and elevation travel
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Mount: Ruggedised mounting system with 8 height options, on the mini-prism footprint
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Finish: Flat Dark Earth
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Warranty: Primary Arms Lifetime Warranty
Technical Specifications
| Product Type |
MicroPrism scope, fixed magnification |
| Magnification |
3x fixed |
| Reticle |
ACSS Raptor 5.56/.308 Yard, glass-etched, red illuminated |
| Illumination |
13 brightness settings, 3 night-vision compatible, with AutoLive |
| Battery |
CR2032, up to approximately 29,000 hours |
| Click Value |
1/4 MOA per click |
| Adjustment Range |
80 MOA windage and elevation |
| Field of View |
38 ft at 100 yards (12.7 m at 100 m) |
| Eye Relief |
2.7 in (69 mm) |
| Length / Weight |
2.95 in (75 mm) / under 8 oz (227 g) |
| Mount |
Mini-prism footprint, 8 height options included |
| Finish |
Flat Dark Earth |
| Warranty |
Primary Arms Lifetime Warranty |
| SKU / MPN / UPC |
PA-SLX-3XMP-RAPTOR-5YP-FDE / 710054 / — |
What's Included
- Primary Arms SLx 3X MicroPrism scope in Flat Dark Earth
- CR2032 battery, lens covers, ruggedised mount with 8 heights and manual
Warranty
Covered by the Primary Arms Lifetime Warranty.
UK Delivery & Support
This prism scope 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
Does a prism scope help with astigmatism?
Yes, for many shooters it does. A prism scope's reticle is etched into the glass and viewed through the optic's own focusing system, so it is resolved by the same corrected optical path as the target, whereas a red dot projects an LED that an astigmatic eye commonly sees as a smear, flare or double image.
Which calibre is the ACSS Raptor 5.56/.308 Yard reticle calibrated for?
The ACSS Raptor 5.56/.308 Yard reticle is calibrated for both 5.56 and .308, and its ranging and holdover marks are laid out in yards.
Is the Flat Dark Earth version optically different from the black one?
No. The Flat Dark Earth Primary Arms SLx 3X MicroPrism has the same optical and mechanical specification as the black version, and only the exterior finish differs.
Does the Primary Arms SLx 3X MicroPrism work if the battery dies?
Yes. The reticle is etched into the glass rather than projected, so it remains fully visible and usable with the illumination switched off or the battery flat.
What mount does the SLx 3X MicroPrism need?
The SLx 3X MicroPrism ships with its own ruggedised mounting system offering 8 height options on the mini-prism footprint, so no separate mount needs to be bought.
What does the ACSS Raptor reticle actually do?
The ACSS Raptor combines a precise centre chevron with bullet drop holdovers so you aim off rather than dial for distance, ranging stadia that estimate the distance to a target of known size, moving-target leads, and wind holds either side of centre.
