The Primary Arms GLx MD-21S (model 810025) is a high-performance micro dot optic built for superior agility and precision from close quarters to intermediate range. It features an advanced solar failsafe system, supplementing the battery to help maximize runtime.

Key Specifications

• Manufacturer: Primary Arms
• Model: GLx
• Product Type: Red dot sight
• Magnification: 1x
• Reticle: 2 MOA red dot
• Power Backup: Solar failsafe system
• Reticle Color: Red
• Application: Close-quarters to intermediate range
• Body Style: Micro dot-sized

Frequently Asked Questions

What does the GLx line add over the SLx line? Primary Arms positions GLx as its premium optics tier, and on the MD-21S that includes a solar failsafe power system not found on the standard SLx MD-21S.

What is the solar failsafe system for? It supplements the battery with solar power, helping ensure the dot stays operational and extending runtime between battery changes.

Buy the Primary Arms GLx MD-21S 2 MOA Red Dot Sight

Shop the Primary Arms lineup or browse more of our Red Dot Sights selection at Schaefer Defense.