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
| Weight | 0.56 oz |
|---|---|
| Click Value | 1 MOA |
| Reticle | 3 MOA Dot |
| Size | Mini Reflex |
| Reticle Color | Red |
| Battery Type | CR2032 |
| MPN | PA-CLX-MRSC-G2 |
| UPC | 818500019824 |
Compliance
NFA (National Firearms Act) compliance is crucial for legal ownership and transfer of regulated firearms and accessories like short-barreled rifles, suppressors, and certain types of ammunition, ensuring adherence to federal regulations to avoid legal penalties and ensure responsible firearm ownership.
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