Primary Arms SLX 1X MicroPrism RDB Sight H1/T1
- Magnification Minimum: 1x
- Magnification Maximum: 1x
- Mounting Type: Picatinny Mount
- Product Style: Tactical
Last refreshed Jun 22, 2026 · Based on the Amazon listing and published specifications, not hands-on testing.
A well-reviewed prism optic for 9mm PCCs with a reticle etched into the glass for battery-independent use, but confirm you're prepared to source a low mount separately if the included high mount doesn't suit your setup.
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ASIN: B0GWFGN8R6Model: SLx 1X MicroPrismCategory: Rifle Scopes
More from this brandAll Primary Arms rifle scopesOverview
The Primary Arms SLX 1X MicroPrism with the ACSS Gemini 9mm reticle is a fixed 1x prism optic built on the H1/T1 micro dot footprint, designed specifically for pistol caliber carbines running 7.5 or 16 inch 9mm barrels.
The listing carries an explicit correction: despite what the packaging, manual and Amazon page state, this ships with only the 2.26 inch high mount, not the low mount some buyers may be expecting. The ACSS Gemini reticle's BDC dots and lead indicator are calibrated specifically for 9mm carbine ballistics, so this is a purpose-built optic rather than a general-purpose red dot alternative.
- ACSS Gemini 9mm reticle etched into glass
- 13 illumination settings with AutoLive
- H1/T1 micro dot footprint, 5.5 oz with battery
- IP67 waterproof, 120 MOA total adjustment travel
Who it's for
Built for pistol caliber carbine shooters who want a reticle etched into glass usable even with a dead battery, and who specifically need the 9mm BDC calibration rather than a rifle caliber reticle.
Pros and cons
- Etched glass reticle works with no battery power
- AutoLive motion sensing conserves battery
- BDC calibrated specifically for 9mm PCC ballistics
- IP67 rated, nitrogen purged for weather resistance
- Ships with only the high mount despite packaging stating a low mount is included
- Reticle calibration is specific to 9mm, not usable as a general rifle reticle
Performance notes
The etched glass reticle means the ACSS Gemini pattern is always visible even without power, while AutoLive illumination adds a red glow through 13 brightness settings and activates via motion sensing when the optic is picked up. The reticle's center chevron and BDC dots are calibrated for 9mm ballistics out to 200 yards, with a horseshoe outer ring for fast close-range acquisition and a built-in lead indicator for targets moving at roughly 8.6 mph.
Specifications
| Brand | Primary Arms |
|---|---|
| Model | SLx 1X MicroPrism |
| Dimensions & fit | |
| Item Weight | 1.06 poundslower than 66% of 238 rifle scopes |
| Construction & materials | |
| Material Type | Aluminum |
| Color | Black |
| Compatibility & installation | |
| Mounting Type | Picatinny Mount |
| Compatible Devices | Rifle |
| Included components | |
| Unit Count | 1 |
| Included Components | 2.26" Mount |
| Warranty & support | |
| Warranty Description | Limited lifetime |
| Other details | |
| Magnification Minimum | 1x |
| Magnification Maximum | 1x |
| Product Style | Tactical |
| Sport Type | Hunting |
| Field Of View | 76.5 feet |
Closest rivals on specs
Frequently asked questions
Does this come with a low mount?
No, despite the packaging and manual stating otherwise, it ships with only the 2.26 inch high mount.
Does the reticle work if the battery dies?
Yes, the ACSS Gemini reticle is etched into the glass, so it remains visible without power, though not illuminated.
What barrel lengths is the BDC calibrated for?
The BDC dots are calibrated for 7.5 inch and 16 inch 9mm barrels out to 200 yards.