Meprolight M21 Day/Night Reflex Sight

The Meprolight M21: Combat-Proven Illumination Without Compromise

Developed for the Israeli Defense Force and trusted by military and law enforcement agencies worldwide, the Meprolight M21 represents a fundamental shift in how reflex sights can perform. This is a sight designed for shooters who demand reliability under all conditions—especially when batteries are not an option.

Dual-Illumination Technology

The M21 employs an elegant solution to the eternal problem of sight illumination: it uses two systems working in perfect harmony.

• Fiber-optic collection by day: Gathers ambient light to illuminate the aiming dot in bright conditions
• Self-powered tritium by night: A miniature tritium light source activates automatically when ambient light fades
• Automatic transition: Switching between systems is instantaneous and seamless

The result is a sight that is always ready—no switches to manipulate, no batteries to check, no power concerns whatsoever.

Optical Performance

The large 30mm diameter lens provides an exceptionally wide field of view, enabling rapid target acquisition with both eyes open. The 4.3 MOA bullseye reticle offers a clean, uncluttered aiming point suitable for close-quarters work and intermediate distances alike.

The sight is fully compatible with night vision goggles and magnifying optics mounted behind it, making it an excellent foundation for a versatile aiming system.

Built for the Real World

Meprolight's construction meets or exceeds MIL-STD-810 standards, ensuring the M21 will function reliably in extreme heat, cold, moisture, and physical shock. This is not a range toy—it is a tool designed to work when conditions are worst and stakes are highest.

Why the M21 Matters

In an age of electronic sights and battery dependencies, the M21 offers something increasingly rare: a completely self-sufficient aiming system. For hunters, sport shooters, and those who value reliability above all else, this sight delivers.