Primary Arms Classic Series 21mm Micro Reflex Sight - 3 MOA Dot

Manufactured by Primary Arms
MPN: 810035
Manufactured by Primary Arms
48 Reviews

In Stock

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The Classic Series™ proves that entry-level optics don’t have to be poor quality optics. Unlike some other brands, Primary Arms doesn't use the word “value” as a euphemism for “junk”. Classic Series red dots are perfect for the budget conscious and the new shooter. Every product is inspected in their facility in Houston to ensure you are receiving the best quality product as the other three tiers. These red dots are backed by the same excellent customer service and support as all other Primary Arms products.

The Primary Arms MRSC Micro Reflex Sight is a continuation of the new line of red dot sights designed specifically for mounting to pistol slides. The Micro Reflex Sight is optimized for compact and micro compact pistols for concealed carry as it features a slightly smaller 21mm lens to keep the profile as slim as possible when mounting on smaller pistols eliminating any overhang on the slide. Even though the lens is smaller than the mini, the square profile offers an unobstructed field of view allowing you to have a clear sight picture every time you present your pistol. It utilizes the RMSc footprint for a wide range of compatibility with milled slides and adapter plates and houses a bottom mounted CR2032 battery offering up to 40k hours of battery life on the medium setting. With 10 total illumination settings, and a daylight bright 3 MOA red dot, this reflex sight is sure to be quick to pick up and easy to use. The lens is fully multicoated for scratch and fog resistance and the 6061 Aluminum housing is extremely durable. If, you are looking for a new red dot for concealed carry you can't go wrong with the Primary Arms MRSC.

Note: After 12 hours of illumination continuously running, the illumination will turn off. To turn the illumination back on, press one of the brightness adjustment buttons and the reticle will reappear.

  • Fits RMSc footprint
  • Compact 21x15mm lens
  • Optimized for micro-compact pistols
  • 3 MOA Red dot
  • Includes CR2032 battery
  • Up to 40k hour battery life
  • Auto-off turns off illumination after 12 hours
  • 10 Brightness settings
  • Compact and lightweight design
  • Fully multicoated lens
  • Backed by Primary Arms Optics Lifetime Warranty
See More


Battery Life25,001 - 50,000 Hours
Battery TypeCR2032 3V Lithium Coin
BrandPrimary Arms
Brightness10 Settings
FinishHardcoat Anodized
Manufacturer.Primary Arms
MaterialAluminum - 6061-T6
Mount CompatibilityShield RMSc
Optic SeriesClassic
Reticle3 MOA Dot
Reticle ColorRed
Weight.56 oz.
  • Learn More About The Primary Arms Micro Reflex Sight
  • Check Out The Micro Reflex Sight In Action
  • Micro Reflex Sight Review: Beyond Seclusion
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

48 reviews


Nothing comes close at this price

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This is micro optic is incredible. I was looking for something inexpensive for my TX22 Compact and after reading the stats and seeing a few reviews, I gave it a try. This optic looks great and feels durable. I will happily recommend this for any micro pistol for carry or range use. I will be giving the Mini a try next.

Great sight overall

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This is a great sight and is the perfect size for a micro compact. Installed on a Ruger Max 9 Pro without any issues. It fits perfectly and looks very good on the gun. The brightness settings allow for plenty of adjustment. The only issue I have found is that it is not low enough to completely cowitness with the iron sights. A simple cut out on the rear (where the adjustment screw is located) would have allowed for a much better sight picture with the iron sights. It allows enough of the front sight to be seen that it's not worth returning but I hope PA can redesign around this flaw. Overall I'm very impressed for the price.

Excellent for what it is

by -

This is not a "go to war sight" and to review it as one is not fair. I would compare this to a Romeo zero, or a Burris fastfire. I think it is adequate for carry if you choose to but maybe not for duty. With that out of the way, this punches way above it's cost bracket. The glass is incredibly clear, the dot is crisp and flicker free regardless of setting. You can spend $100 on a unknown brand from Amazon for airsoft quality stuff. Or, spend about the same for this and get a much better product and support. It may be chinesium but the quality control seems to be there.

Great product, great price!


Great optic & very well made. Love the clarity and adjustability. I had to grind down the screws about 1.5 threads to allow them to not interfere with the plunger. Worth every penny!

Installed on a TX22C and G48 MOS

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Excellent optic for the money. The 3 MOA dot is very crisp and the glass is very clear with minimal color. Super light weight and slick profile. No bells and whistles like shake awake, it could use 1 or 2 more brightness settings but it is very useable on a sunny day. Might not be bright enough for a sunny day in the desert, but great if there is green in the environment.

Good Budget Optic

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I got this optic for my Shield Plus. Since it has the cut for it.
Make sure you buy a battery though. Mine was dead out of the box. I

Works as designed

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nice compact little red dot. easy to pick up the bright dot.

No shots yet but it fits the canik mete sft pro

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Haven't got a chance to out it through its paces yet but wanted to put this review up for those considering it for the canik mete sft pro and other pistols of theirs with the same optic footprint. I wasn't sure if this would come with the necessary screws to mount it even after emailing primary arms. I am happy to report it comes with 3 or 4 different screw sets and some loctite type product(other brand). One of the screw sets it came with fit perfectly so if you have an sft pro or other canik offerings with that same mounting system this will fit out of the box with the appropriate mete sft pro plate(included)

Fast and Just what I needed!

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Great little red dot and the shipping was almost overnight, how can ya beat that.

Amazing Dot

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This is the second PA optic I've purchased and won't be the last! The price is outstanding for the quality!