Meprolight M21 4.3 MOA Bullseye Reflex Sight

The Meprolight M21 is a self-illuminated 1x reflex sight designed for quick aiming in changing light conditions. Its 4.3 MOA Bullseye reticle uses fiber-optic illumination during the day and a self-powered tritium light source at night, with automatic transition between the two systems. The large 30 mm display window supports both-eyes-open aiming and a broad field of view.

With no battery or switch, the M21 is designed for straightforward operation across varied weather and temperature conditions. Adjustable windage and elevation provide setup flexibility, while the weather-resistant black housing is suited to range and field applications.

Key Specifications

• The sight provides 1x magnification for non-magnified aiming.
• The reticle is a 4.3 MOA Dot Bullseye pattern.
• The objective measures 30 mm for a large viewing window.
• Daytime illumination uses a fiber-optic collector system.
• Nighttime illumination uses a self-powered tritium light source.
• The sight has adjustable windage and elevation.
• The field of view is listed as unlimited.
• Eye relief is listed as unlimited.
• The sight weighs 13.12 ounces.
• The finish and color are black.

The M21 combines a clear 30 mm viewing window, an always-available illumination system, and a simple 1x optical format in a compact reflex sight. Its Bullseye reticle and battery-free operation make it a practical option for users who value consistent aiming performance with minimal controls.

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