Primary Arms Classic Series 21mm Micro Reflex Sight - PA-CLX-MRSC-G2

Primary Arms Classic Series 21mm Micro Reflex Sight

Ultra-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 use

Specifications

• 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