The Primary Arms SLx 1X MicroPrism, part number PA-SLX-1XMP-H-9MM-G, is an unmagnified prism scope on the T1/H1 micro-dot footprint carrying the green-illuminated ACSS Gemini 9mm reticle.
The reticle is etched into the glass rather than projected onto it, so it stays sharp for eyes that see an LED dot as a smear or a double image — and it is still there with the illumination switched off.
It is a 1X prism, so there is no magnification to manage and both eyes stay open, and the aiming picture is a precise centre chevron sitting inside a bold horseshoe. Illumination is green and night-vision compatible, with AutoLive motion sensing to bring it up when the rifle moves. Turrets adjust in 1 MOA increments, with 120 MOA of elevation and 120 MOA of windage available, and power comes from a CR2032 coin cell.
The ACSS Gemini is the reason to buy this particular version rather than the general-purpose one: it is calibrated for 9mm from barrels of 7.5 to 16 in (191 to 406 mm), with bullet drop references out to 200 yards plus ranging marks and moving-target leads. Fit it to a 5.56 rifle and it will still aim, but every holdover below the chevron will be wrong, because a pistol cartridge drops far more steeply. For 5.56 and .308 the ACSS Raptor reticle is the right answer.
Why shooters choose the SLx 1X MicroPrism Gemini
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Magnification — 1X prism, both eyes open
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Reticle — glass-etched ACSS Gemini 9mm, green illuminated, usable unlit
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Calibration — 9mm from 7.5 to 16 in (191 to 406 mm) barrels, with drop references to 200 yards
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Aiming point — centre chevron inside a bold horseshoe, with ranging and moving-target references
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Illumination — green, night-vision compatible, with AutoLive motion sensing
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Turrets — 1 MOA per click, 120 MOA of elevation and 120 MOA of windage
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Footprint — T1/H1 micro-dot pattern
What the SLx 1X MicroPrism Gemini fits
It uses the T1/H1 micro-dot footprint, which is the most widely supported mounting pattern going, so it will sit on almost any Picatinny rail through the mount of your choice at the height you want. The same optic is offered with the red ACSS Gemini 9mm reticle, with a general-purpose reticle as the green ACSS Cyclops Gen II, and for rifle calibres as the SLx 3X with ACSS Raptor. Heights are covered in our optic mount height guide.
Specifications
| Type |
MicroPrism scope, unmagnified |
| Magnification |
1X |
| Reticle |
ACSS Gemini 9mm, glass-etched, green illuminated |
| Reticle Type |
Bullet drop compensating |
| Calibration |
9mm, 7.5–16 in (191–406 mm) barrels, drop references to 200 yards |
| Illumination |
Green, night-vision compatible, AutoLive |
| Adjustment |
1 MOA per click |
| Adjustment Range |
120 MOA elevation, 120 MOA windage |
| Battery |
CR2032 3V lithium coin cell |
| Footprint |
T1/H1 micro-dot |
| MPN |
PA-SLX-1XMP-H-9MM-G |
A 1X prism built around one cartridge, which is what makes the holdovers mean something. Order the SLx 1X MicroPrism Gemini today — imported from the USA with all duties paid by us and dispatched tracked from the UK in 7–10 business days, with nothing to pay on delivery.
Explore more: Prism Scopes, SLx 1X MicroPrism Red Gemini or browse all Primary Arms.
