--- title: "Primary Arms 3 MOA RMSc Micro Reflex Sight" description: "Compact 1x pistol optic with a 3 MOA red dot, RMSc/K footprint, 10 illumination settings, motion sensing, and up to 50,000 hours of battery life." canonical_url: "https://www.kygunco.com/product/primary-arms-classic-series-21mm-micro-reflex-sight-3moa-reddot" meta: author: KYGUNCO "og:description": "Compact 1x pistol optic with a 3 MOA red dot, RMSc/K footprint, 10 illumination settings, motion sensing, and up to 50,000 hours of battery life." "og:image": "https://cdn.kygunco.com/assets/products/289288/thumbnail.jpg?v=1787834004" "og:image:height": "500" "og:image:width": "500" "og:title": "Primary Arms 3 MOA RMSc Micro Reflex Sight" --- > Index of every page on this site: [llms.txt](https://www.kygunco.com/llms.txt) [Home](https://www.kygunco.com/) / [Brands](https://www.kygunco.com/brands) / [Primary Arms](https://www.kygunco.com/brand/primary-arms) / PRM-810044 ![Main product image](https://static.kygunco.com/cdn-cgi/image/f=auto,w=600/assets/products/289288/main.jpg?v=1787834004) For illustration purposes only, this image may not be an exact representation of the product. # PRIMARY ARMS Classic Series 21mm Micro Reflex Sight 3MOA RedDot The Primary Arms MRSC Gen 2 Micro Reflex Sight is a compact 1x red dot optic designed for compact and micro-compact pistols. It features a 3 MOA reticle, RMSc/K footprint, 10 illumination settings, motion-sensing activation, a 21mm fully multi-coated lens, and a 6061 aluminum housing. $149.99 ** 5 interest-free payments of **$30** with ![Sezzle logo](https://www.kygunco.com/brands/sezzle.svg) ** Online In Store ** Free Shipping Enjoy delivery to the Lower 48 States at no cost. ** Ships To Your Home Handled by our expert shippers in Bardstown, KY. Almost gone. Order now before it sells out. Item # 289288 Style PRM-810044 UPC 818500019824 Condition New Manufacturer [Primary Arms](https://www.kygunco.com/brand/primary-arms) Weight 2 lb The Primary Arms MRSC Gen 2 Micro Reflex Sight is sized specifically for compact and micro-compact pistols, delivering a clear aiming point without adding unnecessary bulk. Its low-profile design, motion-sensing technology, and long battery life make it a practical upgrade for everyday carry and defensive handguns. FEATURES - AutoLive™ motion-sensing technology powers the optic on with movement and off when stationary - RMSc/K footprint for direct compatibility with many optics-ready pistols - 3 MOA red dot reticle - 10 illumination settings for varying lighting conditions - Daylight-bright aiming point - 6061 aluminum housing for durability - Square lens profile provides a wide, unobstructed sight picture - Fully multi-coated lens enhances light transmission and clarity - Optimized for compact and micro-compact handgun platforms SPECIFICATIONS - Magnification: 1x - Objective Lens Diameter: 21mm - Reticle: 3 MOA Red Dot - Material: 6061 Aluminum - Finish: Hardcoat Anodized Black - Mount Footprint: Shield RMSc / K Pattern - Brightness Settings: 10 - Battery Type: CR2032 - Battery Life: Up to 50,000 Hours - Weight: 0.56 oz - Optic Coating: Fully Multi-Coated Lens ** WARNING: This product contains chemicals known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, go to [www.p65warnings.ca.gov](https://www.p65warnings.ca.gov). 0.0 ** ** ** ** ** 0 reviews ** ** ** ** ** 0 ** ** ** ** ** 0 ** ** ** ** ** 0 ** ** ** ** ** 0 ** ** ** ** ** 0 ## More from Primary Arms ```json {"@context":"https://schema.org","@graph":[{"@id":"https://www.kygunco.com/#website","@type":"WebSite","description":"Shop KYGUNCO for firearms, ammo, accessories, parts, and outdoor gear at low prices with fast, easy nationwide shipping.","name":"KYGUNCO","url":"https://www.kygunco.com/","publisher":{"@id":"https://www.kygunco.com/#/schema/organization/kygunco"}},{"@id":"https://www.kygunco.com/product/primary-arms-classic-series-21mm-micro-reflex-sight-3moa-reddot#webpage","@type":"WebPage","description":"Compact 1x pistol optic with a 3 MOA red dot, RMSc/K footprint, 10 illumination settings, motion sensing, and up to 50,000 hours of battery life.","name":"Primary Arms 3 MOA RMSc Micro Reflex 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