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Reviews & Ratings for Primary Arms Classic 21mm Micro Reflex Sight — 6 reviews

(6 reviews)
Primary Arms Classic 21mm Micro Reflex Sight
Primary Arms Classic 21mm Micro Reflex Sight
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Most Helpful Positive Review Does the Job
I put this on my Glock 43X MOS. The 43X requires an optic plate for some other optics, and I wanted to co-witness stock sights, so I chose this. I like the 3 moa dot size on these smaller window optics. The up/down buttons are in the right place, on opposite sides of the optic. The glass is clear, and the dot is nice as well. I do wish it had shake awake, but turning it off when not in use isn't too bad. The battery is under the optic, but it is a bigger 2032 battery, so it should last a year at least. One thing that I didn't like was that the included screws didn't fit the 43X.
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I understand it's used and fair condition but...

by Jay Atkinson, Verified Owner from FL, United States Written on March 18, 2025
It turns off on its own randomly. And they top edge of the glass is exposed. I definitely would have not labeled this as fair condition...
Pros:
  • I live the classic. This is my 3rd.
Cons:
  • They sent a broken optic...
Best Used for:
  • Nothing going into the junk drawer.
Would recommend: No
Was it helpful to you? Yes | No
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good optic

by x, Verified Owner from AL, United States Written on August 29, 2024
So far so good , no pros no cons just overall good for price point. Would recommend for new gun owners.xx
Would recommend: Yes
Was it helpful to you? Yes | No
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Good fit on my Ruger Mark IV Target

by Adam S., Verified Owner from MO, United States Written on June 2, 2024
I've been pleased with the Primary Arms Micro Reflex sight on my Ruger Mark IV target. Just the right size and brightness. Took some adjusting first time at the range, but performed well.
Pros:
  • good value
Cons:
  • Battery location
Would recommend: Yes
Was it helpful to you? Yes | No
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Great dot, almost perfect!

by Tom Hayes, Verified Owner from CA, United States Written on May 3, 2024
This dot has been great. Holds zero, is clear, small overall and carries well. Battery life is also good. The only bad thing is no shake- awake.
Pros:
  • Quality
Cons:
  • No shake awake
Best Used for:
  • CCW
Would recommend: Yes
1 of 1 found the following review helpful.
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Solid Value Optic

by KM, Verified Owner from MA, United States Written on January 6, 2024
Have this mounted on my G48 MOS. Several hundred rounds with it, no issues and holds zero. Allows for co witness with stock sights. Aluminum housing feels solid. Would be nice to have an audible/tactile click on the adjustment and shake-awake, but for the price it does the job.
Would recommend: Yes
1 of 1 found the following review helpful.
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Last updated 2025-11-12 UTC.