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Primary Arms SLx 3X Micro Magnifier - Flat Dark Earth

Manufactured by Primary Arms
MPN: 510013
Manufactured by Primary Arms
4 Reviews

In Stock

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This Primary Arms rifle scope 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.

The SLx 3x Micro Magnifier is an exciting approach at red dot magnifiers, combining high-clarity 3x magnification with a miniaturized body. 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.


Weighing only 5.3 oz, the SLx 3x Micro Magnifier is a miniaturized, lightweight magnifier that extends the effective range of a red dot sight or 1x prism scope. The SLx 3x Micro Magnifier 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.

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BrandPrimary Arms
ColorFlat Dark Earth
Exit Pupil Diameter7.0mm
Eye Relief2.40 in
Field View 10035.2 ft
Length2.83 in.
Mount CompatibilityPrimary Arms 2-Bolt Magnifier Mounts
Optic SeriesSLx
Weight5.3 oz.
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

4 reviews

  • 4 stars
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Amazing at this price


What can I say primary nailed it yet again this magnifier is stellar at this price point

Never got it.

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Would have liked to give a good review but due to FedEx issues got tired of waiting and canceled my order. Get back to me when you are shipping through another freight company and I'll try again. Until then, you wont get any business from me.

Thank you for taking the time to share your feedback. We sincerely apologize that your recent experience with Primary Arms fell short of your expectations. We value your loyalty as a long-term customer and regret any frustration caused by the issue you encountered.

We strive to provide exceptional customer service and resolve all concerns efficiently. We'd appreciate it if you could share more details about the specific issue you faced. This information will help us investigate further and improve our processes to prevent similar situations.

We're committed to regaining your trust. If you'd be open to it, we'd like to discuss potential solutions and see if we can find a way to earn back your business.

Please feel free to email us at info@primaryarms.com Attention CS manager or call us directly at 713-344-9600 (please advise the agent you are returning the manager's call) to discuss this further.

Very clear

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Great glass quality. Eye relief is pretty good. Have it in front of a Magpul BUIS and it works pretty well. Do have to move my head slightly forward compared to my usual position to eliminate some loss of FOV. Solid construction, excellent product overall

A Quality Magnifier

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Like the reviews I saw before purchasing said, this magnifier is built like a tank. Glass clarity is good, eye-box isn’t too punishing, and adjustment clicks are well defined. The only issue I had is finding a good enough balance between its diopter and the prism optics diopter to get a mutually clear image. That, of course, is the nature of matching a prism optic with a magnifier. With a Vortex Crossfire I had no issues getting good clarity for the dot at all. Against the SLX 1x it took me quite some time to find a fair balance. Once I found it, I couldn’t be happier. Great optic. Great price. Great color finish. Great option.