The Primary Arms Classic Series 21mm Micro Reflex Sight Gen II combines a compact footprint, lightweight construction, and dependable performance into an optic designed specifically for concealed carry and compact handgun applications. Featuring a crisp 3 MOA Green Dot, this micro reflex sight provides rapid target acquisition and enhanced visibility in a wide range of lighting conditions while maintaining an ultra-low-profile design ideal for everyday carry pistols.
One of the standout features of this Gen II model is AutoLive® Technology, an intelligent motion-sensing system that automatically powers the optic down after a period of inactivity and instantly reactivates the reticle when movement is detected. This technology helps preserve battery life while ensuring the sight is always ready when needed. Whether carried daily or stored for extended periods, AutoLive® maximizes efficiency without sacrificing readiness.
Designed around the popular RMSc footprint, this optic offers extensive compatibility with modern optics-ready compact and micro-compact pistols. The RMSc mounting pattern is one of the most widely adopted footprints for slim-profile carry handguns, allowing direct mounting on many factory-cut slides while also supporting a wide selection of adapter plates and aftermarket mounting solutions.
The sight features a bright 3 MOA Green Dot reticle supported by 10 total illumination settings, giving shooters flexibility across changing lighting environments. The multiple brightness levels allow precise adjustment for bright daylight use while also supporting lower-intensity settings suitable for low-light conditions and night vision-compatible applications. Combined with the highly visible green reticle, these illumination settings help ensure fast sight acquisition and improved target focus.
A 21mm lens keeps the optic compact while still providing an unobstructed sight picture. Fully multi-coated glass enhances clarity and light transmission while improving resistance to scratches, moisture, and environmental wear. The rugged 6061-T6 aluminum housing features a hardcoat anodized finish for long-term durability without adding unnecessary weight.
Powered by a CR2032 battery, the optic delivers an impressive 25,001–50,000 hours of runtime, helping reduce maintenance while providing long-term reliability. With its combination of AutoLive® technology, RMSc footprint compatibility, extended battery life, and lightweight design, the Primary Arms Classic Series 21mm Micro Reflex Sight Gen II is an excellent choice for concealed carry, personal defense, and everyday shooting applications.
Key Features
- AutoLive® Motion-Sensing Technology
- 3 MOA Green Dot Reticle
- RMSc Footprint Compatibility
- Designed for Compact & Micro-Compact Pistols
- 10 Total Illumination Settings
- 25,001–50,000 Hour Battery Life
- CR2032 Battery Powered
- Night Vision Compatible
- 21mm Objective Window
- Fully Multi-Coated Lens
- Open Emitter Design
- 6061-T6 Aluminum Housing
- Hardcoat Anodized Finish
- Ultra-Lightweight Design
- Lifetime Warranty
Important Specifications
- Manufacturer: Primary Arms
- Product Line: Classic Series
- Model: Micro Reflex Sight Gen II
- UPC: 818500019947
- MPN: 810049
- Optic Type: Open Emitter Reflex Sight
- Reticle: 3 MOA Dot
- Reticle Color: Green
- Battery Type: CR2032 3V Lithium Coin
- Battery Life: 25,001–50,000 Hours
- Brightness Settings: 10
- AutoLive Technology: Yes
- Night Vision Compatible: Yes
- Emitter Type: Open Emitter
- Material: 6061-T6 Aluminum
- Finish: Hardcoat Anodized
- Color: Black
- Mount Compatibility: Shield RMSc
- Footprint: RMSc Pattern
- Weight: 0.56 oz
- Warranty: Lifetime
- Includes: CR2032 Battery, Mounting Hardware, Adjustment Tool, Lens Cleaning Cloth, User Manual
