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Primary Arms SLx 5X MicroPrism PA-SLX-5XMP-AUR-MIL (Red Illuminated ACSS Aurora MIL Reticle version).
This is the 5x fixed-power model in Primary Arms' ultra-compact SLx MicroPrism lineup. It extends the capabilities of the popular 1x and 3x versions by adding more magnification for improved precision and ranging at mid-to-longer distances while keeping the same lightweight, minimal-footprint design. The ACSS Aurora MIL reticle provides a full mil-based grid for precise ranging, holdovers, and wind calls, making it suitable for precision rifle work, DMR-style setups, or general mid-range engagements. Like other MicroPrisms, it features an etched reticle (visible with or without illumination) and is an excellent option for users with astigmatism who want more than a red dot.
Key Features & Specs
- Magnification: Fixed 5x.
- Reticle: Etched ACSS Aurora MIL with red illumination. Features a full MIL grid offering 10 MILs of elevation and up to 5 MILs of windage on each side. The 5th and 10th MIL markers are bracketed for quick reference, and the 5th horizontal MILs include heavy dots. Designed for comprehensive ranging and engaging targets at extended distances.
- Illumination: 13 brightness settings (including daylight bright) + 3 night vision compatible settings. AutoLive® motion-sensing technology automatically activates illumination on movement and turns it off after inactivity to conserve battery. Powered by one CR2032 battery (included) with up to 29,000 hours runtime on medium setting.
- Optics: 26mm objective lens, 5.1mm exit pupil. Wide field of view: 21.0 ft @ 100 yards. Crystal-clear glass with broadband anti-reflective coatings.
- Adjustments: 0.25 MOA click value. Total travel: 50 MOA elevation and windage.
- Eye Relief: 2.7 inches (usable and forgiving for a prism optic).
- Mounting: Includes a modular mount with 8 different height/configurations (supports absolute co-witness, lower 1/3, and other options via included spacers). The optic body is compatible with industry-standard mini prism mounts (footprint). Removable 1913 MIL-STD base.
- Build Quality: Hardcoat anodized aluminum housing in black. Shock-resistant, fogproof, waterproof. Adjustable diopter for reticle focus. Includes lens covers (anti-reflection device/ARD sold separately).
- Size & Weight: Ultra-compact — Length: 3.31 inches (84 mm). Weight: 8.5 oz (241 g) with battery and mount (without lens covers). Comparable in size/weight to many red dots but with 5x magnification.
- Additional: Lifetime warranty from Primary Arms. Etched reticle functions without power. Diopter adjustment. Nitrogen-purged.
The SLx 5x MicroPrism bridges the gap between compact red dots/prisms and traditional scopes, offering ACOG-like performance in a much lighter and shorter package. Users praise the clear glass, intuitive MIL-based Aurora reticle for ranging/holds, long battery life with AutoLive, and overall ruggedness. Some feedback notes it excels for precision work but the MIL grid may be more detailed than needed for casual mid-range use (compared to the simpler Aurora 5.56/.308 BDC version). Eye relief and eyebox are good but benefit from consistent cheek weld.
Who It's For
- AR-15/DMR or precision-oriented builds needing more magnification than 3x without adding bulk.
- Shooters who prefer MIL-based ranging and holds for versatility across calibers.
- Users with astigmatism seeking an etched-reticle alternative to red dots or holographic sights.
- Tactical, competition, or hunting applications out to several hundred yards where weight and length matter.
