Primary Arms SLx 5X MicroPrism™ Scope - Red Illuminated ACSS Aurora 5.56/.308 Reticle - Yard

Manufactured by Primary Arms
MPN: 710042
Manufactured by Primary Arms
4 Reviews

In Stock

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This Primary Arms MicroPrism is part of the SLx optics line. SLx optics have built a reputation for innovation, reliability, and value. All SLx optics undergo rigorous field-testing during development to best serve you in any environment.

For precision without compromise, the SLx 5x MicroPrism brings an extended range to this lightweight, ultra-compact design. Weighing only 8.5oz with a 3.31" overall length, the SLx 5x MicroPrism is comparable to many red dot sights, though its crystal-clear glass and 5x magnification offer improved precision at even longer distance than the 3x variant. Even in close-quarters, the optic’s wide field-of-view and forgiving eye relief make it easy to snap on target.

Because the SLx 5x MicroPrism uses an etched reticle with adjustable diopter, the user will always have a clear, crisp reticle image, even if they have severe astigmatism. When set to max illumination, the MicroPrism reticle is fully Daylight Bright®. For low-light, this optic offers 3 different NV-compatible settings, accommodating any ambient light level. Paired with the AutoLive® motion-sensing illumination technology, this optic provides an exceptionally long runtime at any brightness setting.

This package also includes the new ruggedized mounting system with industry standard mini-prism footprint, guaranteeing reliability and zero retention through heavy use and adverse conditions. Out of the box, this mount can be set for 8 different mounting heights and configurations, ensuring compatibility with any rifle system.


  • Compatible with MR12 12 O'Clock Mini Reflex Mount
  • Compatible with MDOM Offset Micro Dot Mount
  • Black anodized finish
  • 13 Illumination settings + 3 NightVision; Highest settings are Daylight Bright
  • AutoLive motion-sensing on/off battery saving technology
  • Length: 3.31” Weight: 8.5 oz.
  • Etched Reticle, perfect answer for astigmatism and works without illumination
  • Wide Field of View (21.0 ft @ 100 yds)
  • 50 MOA W/E Adjustments; .25 MOA Click Value
  • 8 Mounting Height Options (incl. AC & L1/3 heights)
  • Uses One CR2032 Battery (Included)
  • Up to 29,000 Hours on medium setting
  • Industry Standard Mini Prism Mount Footprint
  • Eye Relief: 2.7"
  • Lens Covers also included
  • Lifetime Warranty

The ACSS® Aurora 5.56/.308 Yard reticle is part of the patented ACSS Reticle series.

The ACSS Aurora 5.56/.308 reticle is a high-performance BDC reticle with a comprehensive toolset for ranging and engaging targets. This reticle uses yards-based holdovers, which are optimized for 5.56 and .308 cartridges and takes all the guess work out of getting first round hits.

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Battery Life25,001 - 50,000 Hours
Battery TypeCR2032 3V Lithium Coin
BrandPrimary Arms
Click Value1/4 MOA
Eye Relief2.70 in
Field View 10021.00 ft
Focal PlanePrism Scope
Manufacturer.Primary Arms
Mount CompatibilityPrimary Arms MicroPrism, Trijicon Mini-ACOG
Night Vision CompatibleNight Vision Compatible
Optic SeriesSLx
ReticleACSS AURORA 5.56 Y
Reticle ColorRed
Total Elevation Adjustment50 MOA
Total Windage Adjustment50 MOA
Turret FeaturesExposed Turrets, Low Profile, Tool Adjustable
Weight8.5 Oz.
  • Product Overview: SLx 5xMP
California Prop 65 warning

 WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information go to

Ratings & Reviews

4 reviews

  • 3 stars
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by -

I really really want to love this optic. It's extremely compact and lightweight, the reticle is great, the glass quality is decent. Having a 5x optic with the spec sheet this thing boasts is impressive. But the eye box and eye relief are pretty unforgiving. It's not TA31 ACOG levels of bad, but it's fairly close. I understand that there's no such thing as a free lunch when it comes to this stuff, so certain compromises had to be made in order to keep the size and weight where the designers wanted them. But when everything else about the optic is so great, it really makes me wish we had a bit more forgiving of a view.

All in all, it's a good optic, maybe even a great optic. But it's so close to being amazing that it's frustrating.

Great job PA


Awesome optic, really reduces the weight of my rifle even with the piggy back RMR sitting on top. The eye box is a little better than expected for a 5x prism, so again great job.

The reticle and glass are crisp and clear. I immediately bought a second one. I took a 10lb rifle and changed out my LPVO setup and am not rocking an 8 lb 10oz rifle unloaded.

Better than the last one


The eye relief is spot on. I get a clear site picture every time. I had the old 5x and I really enjoyed that one, but this is an improvement. Especially because I had an aurora and they only used meters before. So now I get a lighter scope, still get aurora, and it’s in yards. Big win.

Outstanding Optic

by -

Delivery was very fast and product packaging was high quality. Contained several mounting adapters depending on your preference. Hex tool is high quality and they even include a tube of thread lock. I love ACOGS and so far this has been just as effective as any ACOG I've used in the service. Feels very durable but sorry I'm not doing abuse testing. I highly recommend this optic.