The Primary Arms GLx 1X MicroPrism Scope (part number 710071, SKU PA-GLX-1XMP-CYCLOPS) is a 1x unmagnified prism scope with a 20.5 mm window and a glass-etched ACSS Cyclops reticle in red. It is 2.6 in (66 mm) long, weighs 9.1 oz (258 g), adjusts in 1/2 MOA clicks with 50 MOA of windage and elevation travel, gives a 74.8 ft field of view at 100 yards (24.9 m at 100 m), and runs approximately 14,925 hours on a CR2032 cell at setting 5, with 13 brightness settings of which 3 are night-vision compatible. The housing is nitrogen-purged and sealed to IP67.
This is the premium prism in the range and the answer for anyone who wants red dot handling without red dot optics. The 20.5 mm window is noticeably larger than the SLx prisms, eye relief is near-unlimited so head position is forgiving, and the ACSS Cyclops reticle pairs a fast horseshoe with a precise centre chevron and built-in ranging. Crucially the reticle is etched into the glass, not projected — so an eye with astigmatism sees a clean chevron rather than the smeared comet a red dot produces, and the reticle still works with the illumination off.
How It Compares
This is the premium 1x prism with red illumination. The same optic is offered with green ACSS Cyclops illumination. For a lower-cost 1x prism, the SLx 1X MicroPrism with the ACSS Cyclops Gen II reticle covers the same ground in the SLx line. For magnification, see the SLx 3X MicroPrism with the ACSS Raptor 5.56/.308 Yard reticle or the SLx 5X MicroPrism with the ACSS Aurora MIL reticle. If astigmatism is not a concern and you want the smallest possible sight, compare our red dot sights. 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
- Practical shotgun and 3-Gun, where speed at 1x decides the stage
- Straight-pull AR-platform rifles and Civilian Service Rifle at close and medium range
- Airsoft and training use, where near-unlimited eye relief forgives inconsistent head position
Key Features
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Magnification: 1x unmagnified, with a large 20.5 mm window
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Reticle: ACSS Cyclops, etched into the glass, combining a fast horseshoe, a precise centre chevron and built-in ranging
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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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Eye relief: Near-unlimited, so head position behind the optic is forgiving
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Illumination: Red, 13 settings of which 3 are night-vision compatible, with AutoLive motion sensing and push-button controls
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Battery: CR2032, approximately 14,925 hours at setting 5
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Field of view: 74.8 ft at 100 yards (24.9 m at 100 m)
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Turrets: 1/2 MOA per click, 50 MOA of windage and elevation travel
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Sealing: IP67 rated and nitrogen-purged against fogging
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Mount: Modular mount with 8 height options, on the Trijicon Mini-ACOG and Primary Arms MicroPrism footprint
Technical Specifications
| Product Type |
MicroPrism scope, unmagnified |
| Magnification / Objective |
1x magnification, 20.5 mm window |
| Reticle |
ACSS Cyclops, glass-etched, red illuminated |
| Illumination |
13 brightness settings, 3 night-vision compatible, with AutoLive and push-button controls |
| Battery |
CR2032, approximately 14,925 hours at setting 5 |
| Click Value |
1/2 MOA per click |
| Adjustment Range |
50 MOA windage and elevation |
| Field of View |
74.8 ft at 100 yards (24.9 m at 100 m) |
| Eye Relief |
Near-unlimited |
| Length / Weight |
2.6 in (66 mm) / 9.1 oz (258 g) |
| Water Resistance |
IP67, nitrogen-purged |
| Mount |
Trijicon Mini-ACOG / Primary Arms MicroPrism footprint, 8 height options included |
| SKU / MPN / UPC |
PA-GLX-1XMP-CYCLOPS / 710071 / 818500019473 |
What's Included
- Primary Arms GLx 1X MicroPrism scope
- CR2032 battery and ruggedised mount with 8 height options
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.
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.
What does the ACSS Cyclops reticle do?
The ACSS Cyclops combines a bold horseshoe that draws the eye to the centre quickly at close range with a precise centre chevron for accurate aiming and built-in ranging references for estimating distance to a target of known size.
How is the GLx 1X MicroPrism different from the SLx version?
The GLx 1X MicroPrism has a larger 20.5 mm window, near-unlimited eye relief, improved daylight-bright illumination and IP67 nitrogen-purged sealing, sitting above the SLx prism line in specification.
Does the Primary Arms GLx 1X MicroPrism work if the battery dies?
Yes. The ACSS Cyclops 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 GLx 1X MicroPrism need?
The GLx 1X MicroPrism ships with a modular mount offering 8 height options on the Trijicon Mini-ACOG and Primary Arms MicroPrism footprint, so no separate mount needs to be bought.
Is the GLx 1X MicroPrism waterproof?
The Primary Arms GLx 1X MicroPrism is sealed to IP67 and nitrogen-purged, which protects it against dust ingress, temporary immersion in water and internal fogging.
