Primary Arms SLx MD-25 Rotary Knob 25mm Microdot - 2 MOA Red Dot - Red Dot Bright™

Manufactured by Primary Arms
MPN: 810005
Manufactured by Primary Arms
98 Reviews
No Longer Available
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Note: This item has been discontinued. Please check out the MD-25 Gen II.

After rigorous field testing, this optic has been given a Silver-tier rating by the National Tactical Officers Association.

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

The humble microdot is a hard-to-beat package when you want speed without adding a lot of weight to your firearm. The venerable 30mm red dot is a great option for shooters who prefer to have speed AND a wide field of view through their optic. The SLx MD-25 is here to offer the perfect balance between the two with a compact design that weighs barely 2 ounces more than a standard microdot, yet offers the same field of view as a 30mm red dot! Add in super bright, daytime illumination, an up to 50,000-hour battery life, and the next generation ruggedized micro mount and you'll see how we're pushing the envelope for fast, lightweight optics!


  • Wide field of view
  • Compact, lightweight, and durable
  • Crisp 2 MOA red dot
  • Up to 50,000 hour battery life (5+ years) at medium setting
  • Uses one CR2032 battery (included)
  • Next generation ruggedized mounting system
  • Includes risers and spacers for mounting to 0.96”, 1.41”, 1.54”, or 1.64” central height
  • Compatible with standard micro mounts
  • Fully multi-coated anti-reflective lenses
  • 12 Illumination settings for bright days and night vision compatible
  • Just 3" long and 6.5 Oz.
  • Fog resistant

The SLx 25mm Red Dot been equipped with the next generation ruggedized mounting system. We’ve upgraded everything about the mount from materials and finish to the design to create a mount that will not just clamp securely to your rail, but stand up the rigors of real-world use. Integrated recoil lugs help lock your mount in place against the heaviest recoil while large diameter crossbolts give you significantly improved clamping power and will hold up to significant torque. The included riser is the perfect height for AR-15s and AR-10s, but can be easily removed to for installation on AKs, shotguns, and more.

The SLx 25mm red dot includes the low base, a standard riser, and two different height spacers, as well as appropriate mounting hardware. With just the low base, a central height of 0.96” can be achieved. Add the standard riser for 1.41”. With the riser and thin spacer, your central height will be 1.54”. Using the thick spacer will place the optic at 1.64” height. With these options you can easily configure your optic to perfectly match your firearm and shooting style.

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Battery Life50,000+ Hours
Battery TypeCR2032 3V Lithium Coin
BrandPrimary Arms
Brightness12 Settings
Click Value1/2 MOA
FinishHardcoat Anodized
Mount CompatibilityAimpoint Micro
Night Vision CompatibleNight Vision Compatible
Optic SeriesSLx
Reticle2 MOA Dot
Reticle ColorRed
Weight6.5 Oz.
  • IV8888 Reviews Primary Arms SLx MD-25
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

98 reviews


Great optic

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Works good. Love the mounts it comes with. A great value.

Very happy with it

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Took 3 secs to zero it.. holds zero clear glass
Have it Mounted on my ak

Best dot!

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Great dot for the price! Got one on 3 of my guns. Great customer service!

One of my best rds

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I own acogs rmrs aimpoint pros micros and I really like this rds. I have a OLD (11 years) primary arms rds mounted on a plr16... 9.1 barrel fire breathing 556 all polymer bufferless ar pistol and never had a probelm. I hate the illumination knob on this. mushy and I'm not sure if you intentionally can leave it between numbers and it doesn't draw energy? Because you lose the dot. My dot is cleaner than my aimpoint T2. This is mounted on a supressed 556 bull pup with a quick flip 3x magnifier. I leave it on setting 6. Its my nightstand rifle. @ ⁹⁹ it was a steal if it holds up.

5 stars

by -

Lightweight and has a wide viewing area with a bright red dot.

Study litte guy

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Put this on my 1301, semi auto 12ga. Does it's job, takes the beating and holds up. Well built.

So far, so good.


Initial impression, solid, only 4 stars for now because it's not mounted yet, etc. Red dot goes from NV and visibly faint to extremely bright. The brightness dial is pretty stiff and a little mushy, but very serviceable. The battery cap is the worst part, it's pretty soft aluminum and it wouldn't take many uses of a coin on the opening slot to strip the slot, considering how stiffly the battery cap turns. If that's the worst thing about this sight, then that's not too bad for $100. I just will finger tighten the battery cap going forward, which seems as if that will seal the o-ring just fine. 50k hours battery life, how many times am I going to have to replace the battery anyway.

Awesome value

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I got it on sale for like 120. the quality of this red dot is incredible especially considering what i got it for.
Has tons of brightness settings and even two NVG settings for you boogaloo boys

comes with a riser and two different height adjustment pads for it. didn’t come with a cover but it was only 3 dollars separate. Will be purchasing more PA sights in the future