Reviews & Ratings for Meprolight M21 Self-Powered Day & Night Reflex Sight w/ Dust Covers

Meprolight M21 Self-Powered Day & Night Reflex Sight w/ Dust Covers

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Most Helpful Positive Review Death to batteries!

I just got this, and I already like it better than my Eotech. No batteries, built in qd mounts, built like a tank. When there is sunlight, the reticle is bright, very bright. It is dimmer indoors during the day, but still pleasant and clear. The only time it seems to wash out on me is looking ac...
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Most Helpful Negative Review Triangle reticle is offset, Meprolight customer service doesnt respond to emails.

Bought this sight to go with my X95 seeing as they really are meant for each other. Got it mounted on and took it to the range. That's when I realized that the triangle reticle is all the way at the top of the glass and the only way to see it is to rest my cheek bone almost to the ejection port cove...
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Not what picture showed

by Another Gimmick, Verified Owner from NE, United States Written on August 19, 2026

The size of the reticle is a lot smaller in person!

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Its ok...............

by Reyd, Verified Owner from CA, United States Written on August 8, 2026

Optic wobbles on quick detach mount. Mepro says thats "normal". I say thats a poor design to be accurate past 50ish yards... i have the sights co witness with my irons and i can tell after everyshot the reticle shifts around. Its ok not good

Pros:

You can return it

Cons:

inaccurate

3 of 3 found the following review helpful.

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Know what your getting into

by Ed, Verified Owner from OK, United States Written on May 25, 2026

I have allways wanted one of these and now i have one that being said while these are still functional and not needing batteries is a plus you need to realize a modern red dot is more practical and cheaper but these are still cool

Pros:

cool factor

Cons:

Tinting and dot washout

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Don’t Skimp.

by Aidan Barnett, Verified Owner from CA, United States Written on May 13, 2026

Fantastic, battery free optic!!! If you’re going to be doing more indoor shooting I would get the polarizer (right tool for the right job) but other then at it is amazing.

Pros:

no batteries

Cons:

None

Best Used for:

out door activities

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M21 chevron reticle

by JoJo, Verified Owner from WI, United States Written on December 6, 2025

Excellent optics for a close quarter weapons optic

Pros:

Fast target
Fsst target acquisition

Cons:

no magnification

1 of 1 found the following review helpful.

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Mepro M21 amber triangle

by Mike A., Verified Owner from PA, United States Written on October 24, 2025

I got this optic at a great price. I haven't had a chance to use it yet but its built tough and looks good on an AR. I think the triangle reticle is your best option for longer range work as the top tip of the triangle can be used as your zero. I would certainly recommend the polarizing kit because the reticle does washout when viewed from a dim lit area into a brighter one. I would have given it 5 stars if not for that, but you should expect reticle washout from an optic that does not use batteries. Overall, it's a good choice for an AR optic.

Pros:

seems durable

Cons:

Reticle washout in certain instances

Best Used for:

ar 15

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Metpro 21 full size optic

by Bill jones, Verified Owner from NY, United States Written on June 21, 2025

I set my expectations low thinking I may return it for an Eco tech but honestly, what an amazing optic system clear simple to zero and super accurate!

Pros:

Best full size optic Ive ever owned

Cons:

Blue tint which does not bother me and heavy
Blue tint and heavy

1 of 1 found the following review helpful.

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Meprolight M21

by chuck, Verified Owner from AR, United States Written on March 15, 2025

Purchase the sight for my IWI bull pup. Mounted the sight with the supplied quick attach mount. The sight out of the box would strike the target. Very happy with the triangular reticle. The washout issue is manageable but still a concern at times. Overall very happy with the purchase!!

1 of 1 found the following review helpful.

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mepro m21 red dot

by Tucker Marshall, Verified Owner from MO, United States Written on November 19, 2024

Built like a tank, works as advertised. Definitely need to add the available (on eBay) REM21 LED booster to compensate for this optic’s only downfall which is reticle washout when looking from a shaded area into a bright area. Good price. I would purchase again but I would opt for the triangle reticle.

Best Used for:

CQB (Close Quarters Battle)

1 of 1 found the following review helpful.

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Solid Construction

by JD, Verified Owner from HI, United States Written on November 13, 2024

Watched different YouTube reviews on this optic. Decided to go with the M21 instead of the newer version. It is definitely built solid & works perfectly with my Tavor. Looking to get the additional things that go hand in hand with this optic to maximize it potential.

1 of 1 found the following review helpful.

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Reviews & Ratings for Meprolight M21 Self-Powered Day & Night Reflex Sight w/ Dust Covers — 111 reviews — Page 1