The Primary Arms SLx 3X MicroPrism Scope (part number 710036, SKU PA-SLX-3XMP-RAPTOR-5YP) is a fixed 3x magnification prism scope with a glass-etched ACSS Raptor 5.56/.308 Yard reticle in red. It is 2.95 in (75 mm) long, weighs under 7.95 oz (225 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 29,000 hours on a CR2032 cell across 13 brightness settings, three of which are night-vision compatible.
A prism scope solves a problem a red dot cannot. In a red dot the aiming point is a projected LED, and an eye with astigmatism sees that point of light smeared, flared or doubled — which is why some shooters never get on with red dots and assume the fault is theirs. In a prism scope the reticle is physically 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. If red dots have always looked like a comet to you, this is the class of optic to try.
The etched reticle also stays fully usable with the illumination switched off or the battery flat, which no red dot can claim, and AutoLive motion sensing keeps the cell alive by shutting illumination down when the rifle is still.
How It Compares
This is the red-illuminated black 3X. The same optic is offered with green ACSS Raptor illumination and in Flat Dark Earth with red 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 or the SLx 1X MicroPrism with the ACSS Cyclops Gen II reticle. 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 in 5.56 or .308, where 3x aids target identification
- Straight-pull AR-platform rifles in Great Britain wanting magnification without an LPVO's bulk
- Deer stalking and vermin control where a compact, always-on reticle beats a variable scope
Key Features
-
Magnification: Fixed 3x — real magnification in a body under 3 inches long
-
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
-
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
-
Illumination: Red, 13 settings of which 3 are night-vision compatible, with AutoLive motion sensing, up to 29,000 hours on one CR2032 cell
-
Backup: Fully usable with illumination off or the battery flat
-
Field of view: 38 ft at 100 yards (12.7 m at 100 m)
-
Turrets: 1/4 MOA per click, 80 MOA of windage and elevation travel
-
Mount: Ruggedised mounting system with 8 height options, on the Primary Arms MicroPrism and Trijicon Mini-ACOG footprint
-
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 |
| Reticle Colour |
Red, illuminated and etched |
| Illumination |
13 brightness settings, 3 night-vision compatible, with AutoLive |
| Battery |
CR2032 3V lithium coin cell, up to 29,000 hours at the medium setting |
| Click Value |
1/4 MOA per click |
| Adjustment Range |
80 MOA elevation, 80 MOA windage |
| Field of View |
38 ft at 100 yards (12.7 m at 100 m) |
| Eye Relief |
2.70 in (69 mm) |
| Exit Pupil |
7.4 mm |
| Length / Weight |
2.95 in (75 mm) / under 7.95 oz (225 g) |
| Mount |
Primary Arms MicroPrism / Trijicon Mini-ACOG footprint, 8 height options included |
| Finish |
Black |
| Warranty |
Primary Arms Lifetime Warranty |
| SKU / MPN / UPC |
PA-SLX-3XMP-RAPTOR-5YP / 710036 / 818500015673 |
What's Included
- Primary Arms SLx 3X MicroPrism scope
- CR2032 battery and lens covers
- Ruggedised mounting system with 8 mounting height configuration options and hardware
- User manual and documentation
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.
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.
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, built on the Primary Arms MicroPrism and Trijicon Mini-ACOG footprint, so no separate mount needs to be bought.
How long does the battery last?
The Primary Arms SLx 3X MicroPrism runs for up to 29,000 hours on a single CR2032 cell at the medium brightness setting, helped by AutoLive motion sensing which shuts the illumination down when the rifle is still.
