Primary Arms GLx MD-21s Red Dot Sight

Primary Arms GLx MD-21s Red Dot Sight Product Description

Compact Tube Red Dot Design: The GLx MD-21s features a compact 20 mm tube construction, offering a balance between durability and fast target acquisition.

Illuminated Reticle Options: Available with multiple reticle configurations, including dot and ACSS-based options, providing flexibility for different shooting applications.

Parallax-Free Performance: The optic is free of parallax, allowing intuitive aiming without the need for perfect eye alignment.

Automatic Turn-Off: Includes automatic shut-off functionality to preserve battery life during use.

Durable Aluminium Construction: Built from aluminium with fully multi-coated lenses, ensuring reliable performance in demanding conditions.

Precise Adjustment System: Features 14 mm/100 m (1/2 MOA) click adjustments with a total adjustment range of 100 MOA (≈29.09 MRAD) for both elevation and windage. 

ABOUT THE SERIES

The Primary Arms GLx series represents the brand’s upper mid-tier optics line, combining improved optical performance, durable construction, and practical features.

GLx optics are designed to bridge the gap between SLx and PLx models, offering enhanced quality while maintaining strong value.

ABOUT THE MODEL Primary Arms GLx MD-21s Red Dot Sight

This model is designed as a compact tube-style red dot sight for rifle platforms, offering durability and fast target acquisition.

It features a 20 mm tube diameter, illuminated reticle, CR2032 battery, and fixed mount compatible with standard rail systems.

Key specifications include 71 mm length, 141 g weight, 14 mm/100 m click adjustments, and 100 MOA (≈29.09 MRAD) total adjustment range.

The optic is intended for shooters who require a durable and reliable red dot sight for general-purpose rifle use.

ABOUT THE MANUFACTURER

Primary Arms is a US-based optics manufacturer known for delivering high-value optics and innovative reticle systems across riflescopes, prism optics, and reflex sights.

MAIN FEATURES

• Optic Type: Tube red dot sight
• Tube Diameter: 20 mm
• Reticle: Illuminated (various options)
• Adjustment: 14 mm/100 m / 1/2 MOA
• Adjustment Range: 100 MOA / ~29.09 MRAD elevation & windage
• Parallax: Free of parallax
• Automatic Turn-Off: Yes
• Battery: CR2032
• Length: 71 mm
• Weight: 141 g
• Material: Aluminium
• Lens Coating: Fully multicoated
• Mounting Surface: Aimpoint Micro standard
• Mounting Standard: Aimpoint ACRO
• Color: Black
• Durability: waterproof, fogproof, shock-resistant

WARRANTY

10-year warranty covering material and manufacturing defects under normal use.

IN THE BOX

• Red dot sight
• User manual