Collimator Primary Arms GLx MD-21S 21mm Micro Dot AutoLive ACSS-CQB Red Dot

Primary Arms GLx MD-21S Micro Dot 21 mm with ACSS-CQB reticle is a red dot sight designed for shooters who demand fast response, uncompromising durability, and modern optical solutions. The combination of AutoLive® technology, solar panel, and the innovative ACSS reticle makes every shot precise, quick, and confident.

Features of the Primary Arms GLx MD-21S

• AutoLive® technology — automatically turns on when motion is detected.
• Top solar panel — additional power source and energy protection.
• Low battery indicator — always know your power status.
• ACSS-CQB reticle — fast and precise aiming at various distances.
• Compact Micro Dot — fits standard Micro mounts.
• Aluminum, anodized housing — resistant to shocks, corrosion, and weather conditions.
• IP67 rating — waterproof, dustproof, and fog-resistant.
• Low-profile turrets with high/low position indicators
• Night vision compatible — ready for night operations.
• Button controls on the left side — intuitive and quick adjustments.
• Powered by CR2032 battery (included) — long operating time.
• Lifetime warranty — reliability you can trust for years.

AutoLive® — a red dot that thinks for you

The automatic activation feature ensures the sight is ready exactly when you need it. When not in use, the sight enters sleep mode, conserving battery without your intervention.

Reliability in any conditions — IP67 and solar panel

The GLx MD-21S is designed for extreme conditions. Its IP67 rating protects against rain, dust, and mud. The solar panel on top supports the sight when the CR2032 battery is running low, indicated by the built-in low battery indicator.

Image quality and ACSS-CQB reticle

The ACSS-CQB reticle allows for rapid target acquisition at close range and precise shooting at longer distances. Multi-coated anti-reflective lenses provide a bright, sharp, and detailed image, and night vision compatibility expands tactical possibilities.

Primary Arms GLx MD-21S — one sight, full control

This is an advanced tool for professionals and enthusiasts who value accuracy, durability, and versatility. Whether on the range, in the forest, or in tactical scenarios, this is a sight you can trust.