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

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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 Deal


Works flawlessly. The battery life is no lie, I have had this sight on setting 6/11 (easily bright enough for daylight) for over 13,000 hours on the same battery. Great reticle and very reliable. Absolutely perfect for HD rifle.

For sure my favorite red dot, the price is unbeatable for what you get in return.

high quality but have not used yet

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so far it mounted nicely and the extra mount bases ared a real plus on my new ruger pc9 carbine... the extra sight view is great

New Favorite


Absolutely love this red dot. The reticle makes it so much easier to accurately and quickly get on target. The chevron is much nicer then a traditional circle dot. Add a magnifier and that’s when the BDC really makes shooting distance much easier. Functions are simple and getting zeroed was no problem. This is by far my new favorite red dot


by -

This is a great entry level budget friendly optic definitely definitely recommend it.

Great Red dot

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Tactile rotary brightness adjustment including night vision settings. Wide adjustment range. Sturdy construction.

Optic cover not included

Bad made Great!

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So, quick review I received this optic when they just came out. I was unhappy, mine didn't work and I let PA know it. They made it great, by replacing it and it works just like I wanted! Thank you PA for putting up with my attitude you made my so happy now!

Another homerun for PA optics

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Large clear optic, my 4th PA brand red dot. Only knock is the dot brightness/on/off knob is WAY too difficult to turn. It will never move by accident, that's for sure! A wonderful optic with a lifetime warranty, and an excellent price.

Lens Cap Correction

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My review on 11/2020 I made an error on one of the lens caps... Use the Butler Creek Objective caps... The #7 for the objective and the #3 for the ocular... I put the 5 and 3 sorry


by -

Very nice sight. Mounting and sighting in on my shotgun was easy. Good clarity and brightness adjustments. Would recommend.

A true winner


I've been running this on my patrol rifle for about two years now. It has proven to hold zero during random wear n tear be it during work while mounted, coming in and out during deployment needs, and the severe cold to extreme(ish) heats in the midwest. Truly a winner for the price.