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Primary Arms SLx 3X Micro Magnifier - ACSS Pegasus Ranging Reticle

Manufactured by Primary Arms
MPN: 510011
Manufactured by Primary Arms
16 Reviews

In Stock

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The SLx 3x MicroMagnifier with ACSS Pegasus reticle is an exciting approach at optical magnifiers, combining high-clarity 3x magnification with a miniaturized body and a built-in ranging reticle. This new optic is part of Primary Arms’ SLx line. SLx optics built Primary Arms Optics’ reputation for innovation, reliability, and value. All SLx optics undergo rigorous field-testing during development to best serve users in any environment.

Note: Pictured with ACSS, 2 MOA dot, or EOTECH reticle. Due to the design of the Unity Tactical flip to center mount, the reticle will be canted. We recommend the non-reticle version for use with Unity Tactical mounts.


  • Compatible with 2-Bolt Magnifier Mounts
  • ACSS Pegasus ranging reticle
  • 3x Magnification
  • 21mm Objective lens diameter
  • 7.0mm Exit pupil
  • 5.3 ounces
  • Compact design

Weighing only 5.3 oz, the SLx 3x MicroMagnifier is a miniaturized, lightweight magnifier that extends the effective range of a red dot sight or 1x prism scope. The SLx 3x MicroMagnifier features an innovative ‘micro-sized’ design that reduces its footprint compared to traditional magnifiers. This makes it ideal for close-quarters carbines, where agility, ergonomics, and handling speed are paramount.

The SLx 3x MicroMagnifier is also the first magnifier with an option for ACSS Pegasus, a specialized ranging tool designed specifically for optic magnifiers. While most magnifiers simply magnify the primary optic’s reticle, the ACSS Pegasus adds an auto ranging ladder to the system, allowing marksmen to range and engage their targets more effectively. The low-profile offset design integrates seamlessly with your optic’s existing reticle, and the intuitive layout makes it easy to derive precise range estimates in seconds.

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BrandPrimary Arms
Exit Pupil Diameter7.0 mm
Eye Relief2.40 in
Field View 10035.2 ft
Length2.83 in.
Manufacturer.Primary Arms
Mount CompatibilityPrimary Arms 2-Bolt Magnifier Mounts
Optic SeriesSLx
Weight5.3 Oz
  • Onboard Passive Ranging - PA SLx 3X Micro Magnifier with ACSS Pegasus ~ Rex Reviews
  • Primary Arms Pegasus Magnifier
  • Primary Arms 3X Magnifier Pegasus Reticle Review
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 www.P65Warnings.ca.gov.

Ratings & Reviews

16 reviews

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Attractive 3x Magnifier

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This is Pegasus 3x Magnifier is attractive and the option to move the reticle around to wherever you want gives you flexibility.

The real deal


This thing is amazing. I use this with my EXPS3-4 with the BDC. Before, I never had a way to range targets. Eye relief, construction, glass quality design are all superb. Bought this with the new SLx Flip-To-Side Magnifier Mount. Stop wasting your time, and buy it all ready. You wont regret it.

First Magnifier

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Mounting was easy. I got the Primary Arms SLx Rotary Knob 25mm Microdot with ACSS-CQB Red Dot Reticle first and using the Magnifier with it makes using the BDC feature in the reticle much easier. The swing away mount works well and I've had zero problems with the magnifier staying in place or staying out of the way.

Great compact Magnifier

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This is a great little piece of kit to add. I use it with my EXPS3-0 and it does a good job of helping me with shot placement.

Would like to know what size of scopecoat to use though.

The First Magnifier I Actually Liked.


Sleek, simple, tiny, compact, and the reticle works great! The unit is incredibly compact. The glass quality is great and works as a pocket monocular just as well as an optics magnifier. What is really unique about this set up is the ACSS Pegasus reticle that features quick stadiametric ranging brackets. Unlike a LASER rangefinder, this thing requires no batteries as the reticle is etched in the glass plus you can range through thicket, branches, grass etc. as long as you can see the object behind it. Also does not project energy if being used against the near-peer adversary.



I had the PA 3rd gen LER 3x magnifier on a larue 755 mount with an Eotech Exps and eventually got rid of the magnifier setup simply because the weight felt cumbersome...but this thing is lightweight and crystal clear...and the new PA flip to side mount, dare I say, it confidently flips and locks in place just like the larue mount did. It's great to have a magnifier setup again without the bulk.

Incredible value and crystal clear


I bought this to go with another ACSS scope and it works VERY well. Ranges were spot on with several types of ammunition and makes estimating man-sized targets simple, without the need for a rangefinder. Pair it with a PA flip-to-the-side mount and your red dot or prism scope is ready for action! Highly recommended!

Great magnifier

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This is great as long as you line it up perfectly.

Wow just wow! Primary has another home run.


I purchased this and the upgraded mount without the pushbutton release. And perfection this magnifier is amazing. The glass is crystal clear. The ranging reticle is awesome and very simple to center. It's light and still feels like it built like a tank. Thanks again primary arms for best values in optics.

Very happy

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Thos is a very nice magnifier. Get the 1.41 flip to side to go with it to a bunch of adjustments options
It works well with the MD-25 acss red dot I am very pleased.