Primary Arms CS 21mm Micro Reflex Sight Gen 2 with Autolive® – 3 MOA Red Dot

Primary Arms CS 21mm Micro Reflex Sight Features and Performance

The Primary Arms CS 21mm Micro Reflex Sight is a compact pistol optic built for fast target acquisition, lightweight handling, and dependable everyday performance. Designed for shooters who want a minimal-footprint red dot for carry and defensive pistols, the Primary Arms CS 21mm Micro Reflex Sight offers a practical balance of size, durability, and simple usability.

This optic uses a 3 MOA red dot, giving shooters a clean aiming point that is easy to track for close-range speed and deliberate shot placement. With 10 brightness settings and night vision compatibility, it can be adjusted for a wide range of lighting conditions, from bright daylight to lower-light environments. That flexibility makes it a solid option for users who want a compact optic that remains useful across different shooting conditions.

Built from 6061-T6 aluminum with a hardcoat anodized black finish, the Primary Arms CS 21mm Micro Reflex Sight is designed for durability while keeping overall weight extremely low. At just 0.56 ounces, it adds modern red dot capability without making the handgun feel top-heavy or bulky. Its compact layout helps preserve natural handling, which is especially important for concealed carry and slim pistol configurations.

Powered by a CR2032 3V lithium coin battery, the Primary Arms CS 21mm Micro Reflex Sight offers a battery life rated from 25,001 to 50,000 hours. Compatibility with the Shield RMSc footprint adds practical flexibility for a variety of optics-ready handgun slides. Its combination of light weight, durable construction, and straightforward red dot performance makes it a strong choice for shooters who want a compact micro optic with practical everyday usability. For more optics and firearm accessories, visit our accessories collection.

To learn more about manufacturer specifications and product information, see Primary Arms’ official product resources.