Primary Arms SLx 3X Micro Magnifier

Manufactured by Primary Arms
MPN: 510010
Manufactured by Primary Arms
19 Reviews

In Stock

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The SLx 3x MicroMagnifier is an exciting approach at optical 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.


  • Compatible with this Unity Tactical FAST Mount
  • 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.

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BrandPrimary Arms
Exit Pupil Diameter7.0 mm
Eye Relief2.40 in
Field View 10035.2 ft
Manufacturer.Primary Arms
Optic SeriesSLx
Weight5.3 Oz
  • Learn More About The Primary Arms SLx Micro Magnifier
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

19 reviews


Small, clear magnifier.


It is definitely smaller then my holosun and vortex, and lighter. Glass is crystal clear.

I purchased it to put behind the PA 1x micro prism, which I love, but even though they say its compatible, it doesn’t appear so. I ran the diopter all the way out on the magnifier and the reticle was still way too fuzzy so I moved the prism dioter half way out and it became crystal clear when looking thru the magnifier, but when I moved the magnifier the prism was too out of focus. There was no middle ground. It was either one was clear and other was way out of focus, or both were slightly out of focus.

Bummer it doesnt come with a mount.

Works Great, Quality Product

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Does the job, works as advertised. Highly recommended.

Solid, nice feeling magnifier


NOTE: This don't come with a mount, I got the 2 screw flip to side one also made by PA.
The magnifier's quality and finish seem really well done,and the glass clarity and light transmission are fine. The eyebox is somewhat narrow, but that's to be expected with magnifiers in general. I use this magnifier with the Swampfox Blade 1X Prism Optic, it required it bit of adjustment from the magnifier to center and focus on the reticle, but when I was finished it was very clear and in the center of the optic's view. Love the magnifier, feels really good for the price.

Lightweight and Great Other Than Eye Relief


I wanted to have a chance to shoot a match using this magnifier before writing a review and I got that done yesterday so here's my initial review. The glass is shockingly good, the weight is light at around 8 oz total with mount, and I would absolutely adore the magnifier instead of only liking it if not for the eye relief. I run the magnifier as far back as it can go on my rail and even still I have to consciously put my head forward to get an ideal sight picture.

That said, despite the short eye relief I had no problem shooting from relatively difficult positions and it made life easy when prone. I had zero issues seeing the roughly 6" plate out 350 yards.

For the price and weight it's really hard to beat despite the eye relief. I have friends with expensive magnifiers and red dots that look less clear and weigh significantly more that are only nicer in terms of eye box.

Excellent mMagnifier

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Using with the 1X Cyclops. Works great!

Great glass

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Absolutely fantastic magnifier, side by side with my buddies Eotech and can’t see much difference except the significant difference in size. This think is slick and works great, great paired with red dot or micro prism!

Need a matching riser for the new 1.93” style


I’m thinking of using a 1.93” height stand for my micro prism 1x, I need something to add the height on the 3x magnifier to match. Thanks PA!

Well Worth It


Using it behind an eotech and I have to say glass is crystal clear. I have 2 eotech magnifiers and this is just as good at 1/3 of the cost and smaller. Wish I tried this out before I spend 5-600 on the eotech magnifiers I would have saved a lot of money.

Nice and solid

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I don't have much experience with magnifiers, but this feels very solidly built and the glass is very clear. It was easy to set up and use. The price is excellent and feels like it would cost twice as much.

Big things come in small packages

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Very happy with the quality in this micro magnifier. Fit seamlessly with my red dot and is perfect size for my 10.3 AR upper. Would buy again.