Primary Arms GLx MD-21S 21 mm Micro Dot AutoLive ACSS-CQB Red Dot collimator (PA-GLX-MD-21S-ACSS)

Primary Arms GLx MD-21S 21 mm Micro Dot AutoLive ACSS-CQB Red Dot Sight (PA-GLX-MD-21S-ACSS)

This compact red dot sight is designed for shooters who demand speed, precision, and durability in a wide range of conditions. It combines advanced technologies such as AutoLive® motion activation and a solar backup system to ensure the optic is always ready when needed. The innovative ACSS-CQB reticle enhances both close-quarters targeting and longer-distance accuracy. Built with rugged materials and modern optics, it is suitable for professional and recreational use alike.

The GLx MD-21S Micro Dot features a 21 mm objective lens and is engineered for fast target acquisition and reliable performance. Its intelligent design integrates AutoLive® technology, which automatically activates the sight when motion is detected and switches it to sleep mode when idle, conserving battery life without user input.

A top-mounted solar panel provides an additional power source, extending operational reliability, especially when the CR2032 battery runs low. A built-in low battery indicator ensures you are always aware of the power status.

Key Features

• AutoLive® technology for automatic activation on movement

• Integrated solar panel for supplemental power

• Low battery indicator for power monitoring

• ACSS-CQB reticle for fast and precise targeting at varying distances

• Compact Micro Dot design compatible with standard Micro mounts

• Durable anodized aluminum housing resistant to shock, corrosion, and weather

• IP67 rating for water, dust, and fog resistance

• Low-profile adjustment turrets with clear high/low indicators

• Night vision compatibility for low-light operations

• Side-mounted push-button controls for quick and intuitive adjustments

• Powered by a CR2032 battery (included) with long runtime

• Lifetime manufacturer warranty

Performance and Reliability

The optic is built to operate in harsh environments. Its IP67 rating ensures resistance to water immersion, dust, and fogging, making it dependable in rain, mud, and extreme conditions. The solar panel enhances reliability by supporting the power system when the battery is depleted.

Optics and Reticle

The ACSS-CQB reticle allows for rapid target acquisition at close range while maintaining precision at longer distances. Multi-coated anti-reflective lenses deliver a bright, sharp, and high-contrast image. Compatibility with night vision devices further expands its tactical usability.

Usage

This red dot sight is suitable for a wide range of applications, including shooting ranges, outdoor environments, and tactical scenarios. It is designed for users who require a balance of speed, accuracy, and durability in a single optic.

Technical Specifications

• Dot color: red

• Reticle type: ACSS CQB

• Housing material: aluminum

• Maximum elevation adjustment: 100 MOA

• Maximum windage adjustment: 100 MOA

• Objective diameter: 21 mm

• Weight: 141 g

• Power supply: 1 × CR2032 battery

• Warranty: lifetime manufacturer warranty

• Manufacturer: Primary Arms

• Supplier code: PA-GLX-MD-21S-ACSS