Primary Arms Classic Series 21mm Micro Reflex Sight

Primary Arms Classic Series 21mm Micro Reflex SightUltra-compact, budget-friendly, carry-ready optic.The Primary Arms Classic Series 21mm Micro Reflex Sight is designed to bring reliable performance and quick target acquisition to micro-compact pistols, making it ideal for everyday carry. With a 3 MOA daylight-bright red dot, 10 brightness settings, and a fully multicoated lens, this optic provides a crisp, clear sight picture in a wide range of lighting conditions.Engineered to fit the RMSc footprint, this ultra-compact red dot eliminates slide overhang on small pistols like the Sig P365X/XL, and other slim-frame optics-ready handguns. Its 6061 aluminum housing is built for real-world durability, while a bottom-mounted CR1632 battery powers the sight for up to 40,000 hours. The auto-off feature powers the optic down after 12 hours to conserve battery life, and manual brightness controls allow quick adjustments.Whether you're a new shooter or seasoned EDC enthusiast, the Classic Series micro red dot delivers trusted performance without breaking the bank-all backed by the Primary Arms Lifetime Warranty.Features 3 MOA red dot with 10 brightness settings (8 daylight, 2 night vision) Fits RMSc footprint - optimized for micro and subcompact pistols Compact 21mm x 15mm lens for low-profile slide fit Up to 40,000-hour battery life (CR1632 included) Auto-off after 12 hours to conserve power Fully multicoated lens - anti-scratch, anti-fog, and clear optics 6061-T6 aluminum housing with anodized finish Parallax-free with unlimited eye relief Lightweight and durable for concealed carry useSpecifications Reticle: 3 MOA Red Dot Brightness Settings: 10 (8 Daylight, 2 NV) Power Source: CR1632 (bottom-loaded) Battery Life: Up to 40,000 hours Magnification: 1x Parallax Free: Yes Lens Size: 21mm x 15mm Housing: 6061-T6 Aluminum Footprint: RMSc Dimensions: 1.6" x 0.98" x 0.95" Weight: 1 oz Waterproof Rating: IPX7 Mounting: RMSc-compatible slides or adapter plates