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Questions & Answers
how well would it mount to a p365 that optic ready ? Expert Answer

The Primary Arms Classic 21mm Micro Reflex Sight will mount directly to an optic ready P365 without the need for any adapter plates.

by Ethan, Gear Expert, May 31, 2024
Well this mount on my sig p250? Expert Answer

Because the P250 does not come optic ready from the factory, the only way you would be able to mount an optic is by having your slide milled, or by using an adapter plate that replaces your rear sight. This particular optic uses the micro RMSc optic footprint. Which means to install it, you would need to use a Leupold Deltapoint Pro adapter plate, or have your slide milled for the Deltapoint Pro footprint. Email us at Techsales@opticplanet.com for further assistance.

by Ethan, Gear Expert, October 17, 2023
Customer Reviews
Helpful Positive Review Great dot, almost perfect! by Tom Hayes, Verified Owner, 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.
1/1 found this helpful
Helpful Positive Review Solid Value Optic by KM, Verified Owner, 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 fo...
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1/1 found this helpful
Helpful Positive Review Does the Job by KC, Verified Owner, February 19, 2023
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 ...
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8/9 found this helpful
Most Recent Reviews I understand it's used and fair condition but... by Jay Atkinson, Verified Owner, 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...
Most Recent Reviews good optic by x, Verified Owner, August 29, 2024
So far so good , no pros no cons just overall good for price point. Would recommend for new gun owners.xx
Most Recent Reviews Good fit on my Ruger Mark IV Target by Adam S., Verified Owner, 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.
Read All 6 Reviews
Color: Black Finish: Anodized Fabric/Material: Aluminum Objective Lens Diameter: 21 mmReticle: 3 MOA Dot Adjustment Type: MOA Emitter Type: Open Battery Type: CR2032 Battery Quantity: 1 Water Resistance Level: Waterproof Shockproof: Yes Fogproof: Yes Gun Make: AR Platform Gun Model: AR-15 Condition: Used Condition Quality: Fair Condition Details: Installed/Mounted Package Type: Box Quantity: 1 Red Dot Sights-Footprint: RMS

Code: 29R-RD-CSMRRF-810035-EDEMO1

MPN: 810035-EDEMO1

Product No Longer Available

Product Info for Primary Arms Classic 21mm Micro Reflex Sight

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.image

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

Features of Primary Arms Classic 21mm Micro Reflex Sight:

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

Package Contents:

  • Primary Arms Classic 21mm Micro Reflex Sight

Red Dot Accessories

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Related Products to Primary Arms Classic 21mm Micro Reflex Sight

Primary Arms Classic 21mm Micro Reflex Sight Unavailable & Discontinued Models

List of Unorderable Models

USED Primary Arms Classic Series Micro Reflex Sight Dot, 21mm, 3 MOA Dot Reticle, Black, 810035, EDEMO1, Used, Condition Fair , MPN: 810035-EDEMO1 , Code: 29R-RD-CSMRRF-810035-EDEMO1
USED Primary Arms Classic Series Micro Reflex Sight Dot, 21mm, 3 MOA Dot Reticle, Black, 810035, EDEMO3, Condition Parts Only/Salvage, Defective , MPN: 810035-EDEMO3 , Code: 29R-RD-CSMRRF-810035-EDEMO-DF-F
USED, Primary Arms Classic Series Micro Reflex Sight Dot, 21mm, 3 MOA Dot Reticle, Black, 810035 , MPN: 810035-EDEMO , Code: 29R-RD-CSMRRF-810035-EDEMO-IN-D
Primary Arms Classic Series Micro Reflex Sight Dot, 21mm, 3 MOA Dot Reticle, Black, 810035 , MPN: 810035 , UPC: 818500018322 , Code: 29R-RD-CSMRRF-810035
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